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Add function compare_versions to documentation. Update docstrings for surrounding functions in manual.
author Rik <octave@nomad.inbox5.com>
date Sat, 29 Jan 2011 16:54:14 -0800
parents 440a6b54e6f1
children 11faa69c4eaa
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fd0a3ac60b0e update copyright notices
John W. Eaton <jwe@octave.org>
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1 @c Copyright (C) 1996-2011 John W. Eaton
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2 @c
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3 @c This file is part of Octave.
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4 @c
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5 @c Octave is free software; you can redistribute it and/or modify it
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6 @c under the terms of the GNU General Public License as published by the
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7 @c Free Software Foundation; either version 3 of the License, or (at
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8 @c your option) any later version.
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9 @c
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10 @c Octave is distributed in the hope that it will be useful, but WITHOUT
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11 @c ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 @c FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 @c for more details.
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14 @c
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15 @c You should have received a copy of the GNU General Public License
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16 @c along with Octave; see the file COPYING. If not, see
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17 @c <http://www.gnu.org/licenses/>.
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18
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19 @node System Utilities
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20 @chapter System Utilities
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21
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22 This chapter describes the functions that are available to allow you to
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23 get information about what is happening outside of Octave, while it is
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24 still running, and use this information in your program. For example,
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25 you can get information about environment variables, the current time,
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26 and even start other programs from the Octave prompt.
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27
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28 @menu
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29 * Timing Utilities::
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30 * Filesystem Utilities::
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31 * File Archiving Utilities::
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32 * Networking Utilities::
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33 * Controlling Subprocesses::
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34 * Process ID Information::
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35 * Environment Variables::
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36 * Current Working Directory::
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37 * Password Database Functions::
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38 * Group Database Functions::
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39 * System Information::
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40 * Hashing Functions::
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41 @end menu
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42
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43 @node Timing Utilities
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44 @section Timing Utilities
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45
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46 Octave's core set of functions for manipulating time values are
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47 patterned after the corresponding functions from the standard C library.
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48 Several of these functions use a data structure for time that includes
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49 the following elements:
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50
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51 @table @code
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52 @item usec
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53 Microseconds after the second (0-999999).
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54
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55 @item sec
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56 Seconds after the minute (0-61). This number can be 61 to account
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57 for leap seconds.
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58
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59 @item min
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60 Minutes after the hour (0-59).
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61
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62 @item hour
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63 Hours since midnight (0-23).
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64
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65 @item mday
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66 Day of the month (1-31).
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67
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68 @item mon
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69 Months since January (0-11).
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70
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71 @item year
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72 Years since 1900.
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73
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74 @item wday
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75 Days since Sunday (0-6).
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76
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77 @item yday
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78 Days since January 1 (0-365).
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79
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80 @item isdst
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81 Daylight Savings Time flag.
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82
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83 @item zone
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84 Time zone.
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85 @end table
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86
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87 @noindent
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88 In the descriptions of the following functions, this structure is
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89 referred to as a @var{tm_struct}.
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90
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91 @DOCSTRING(time)
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92
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93 @DOCSTRING(now)
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94
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95 @DOCSTRING(ctime)
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96
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97 @DOCSTRING(gmtime)
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98
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99 @DOCSTRING(localtime)
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100
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101 @DOCSTRING(mktime)
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102
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103 @DOCSTRING(asctime)
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104
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105 @DOCSTRING(strftime)
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106
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107 @DOCSTRING(strptime)
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108
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109 Most of the remaining functions described in this section are not
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110 patterned after the standard C library. Some are available for
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111 compatibility with @sc{matlab} and others are provided because they are
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112 useful.
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113
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114 @DOCSTRING(clock)
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115
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116 @DOCSTRING(date)
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117
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118 @DOCSTRING(etime)
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119
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120 @DOCSTRING(cputime)
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121
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122 @DOCSTRING(is_leap_year)
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123
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124 @anchor{doc-toc}
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125 @DOCSTRING(tic)
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126
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127 @DOCSTRING(pause)
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128
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129 @DOCSTRING(sleep)
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130
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131 @DOCSTRING(usleep)
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132
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133 @DOCSTRING(datenum)
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134
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135 @DOCSTRING(datestr)
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136
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137 @DOCSTRING(datevec)
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138
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139 @DOCSTRING(addtodate)
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140
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141 @DOCSTRING(calendar)
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142
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143 @DOCSTRING(weekday)
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144
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145 @DOCSTRING(eomday)
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146
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147 @DOCSTRING(datetick)
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148
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149 @node Filesystem Utilities
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150 @section Filesystem Utilities
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151
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152 Octave includes the following functions for renaming and deleting files,
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153 creating, deleting, and reading directories, and for getting information
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154 about the status of files.
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155
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156 @DOCSTRING(rename)
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157
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158 @DOCSTRING(link)
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159
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160 @DOCSTRING(symlink)
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161
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162 @DOCSTRING(readlink)
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163
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164 @DOCSTRING(unlink)
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165
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166 @DOCSTRING(readdir)
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167
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168 @DOCSTRING(mkdir)
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169
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170 @DOCSTRING(rmdir)
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171
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172 @DOCSTRING(confirm_recursive_rmdir)
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173
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174 @DOCSTRING(mkfifo)
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175
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176 @DOCSTRING(umask)
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177
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178 @anchor{doc-lstat}
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179 @DOCSTRING(stat)
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180
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181 @DOCSTRING(fileattrib)
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182
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183 @DOCSTRING(isdir)
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184
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185 @DOCSTRING(glob)
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186
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187 @DOCSTRING(fnmatch)
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188
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189 @DOCSTRING(file_in_path)
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190
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191 @DOCSTRING(tilde_expand)
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192
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193 @DOCSTRING(canonicalize_file_name)
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194
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195 @DOCSTRING(movefile)
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196
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197 @DOCSTRING(copyfile)
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198
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199 @DOCSTRING(fileparts)
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200
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201 @DOCSTRING(filesep)
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202
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203 @DOCSTRING(filemarker)
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204
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205 @DOCSTRING(fullfile)
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206
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207 @DOCSTRING(tempdir)
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208
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209 @DOCSTRING(tempname)
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210
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211 @DOCSTRING(P_tmpdir)
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212
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213 @DOCSTRING(is_absolute_filename)
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214
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215 @DOCSTRING(is_rooted_relative_filename)
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216
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217 @DOCSTRING(make_absolute_filename)
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218
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219 @node File Archiving Utilities
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220 @section File Archiving Utilities
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221
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222 @DOCSTRING(bunzip2)
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223
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224 @DOCSTRING(gzip)
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225
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226 @DOCSTRING(gunzip)
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227
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228 @DOCSTRING(tar)
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229
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230 @DOCSTRING(untar)
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231
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232 @DOCSTRING(zip)
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233
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234 @DOCSTRING(unzip)
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235
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236 @DOCSTRING(pack)
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237
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238 @DOCSTRING(unpack)
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239
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240 @DOCSTRING(bzip2)
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241
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242 @node Networking Utilities
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243 @section Networking Utilities
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244
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245 @menu
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246 * FTP Objects::
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247 * URL Manipulation::
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248 @end menu
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249
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250 @node FTP Objects
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251 @subsection FTP Objects
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252
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253 @DOCSTRING(@ftp/ftp)
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254
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255 @DOCSTRING(@ftp/mget)
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256
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257 @DOCSTRING(@ftp/mput)
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258
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259 @DOCSTRING(@ftp/ascii)
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260
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261 @DOCSTRING(@ftp/binary)
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262
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263 @node URL Manipulation
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264 @subsection URL Manipulation
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265
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266 @DOCSTRING(urlread)
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267
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268 @DOCSTRING(urlwrite)
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269
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270 @node Controlling Subprocesses
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271 @section Controlling Subprocesses
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272
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273 Octave includes some high-level commands like @code{system} and
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274 @code{popen} for starting subprocesses. If you want to run another
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275 program to perform some task and then look at its output, you will
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276 probably want to use these functions.
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277
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278 Octave also provides several very low-level Unix-like functions which
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279 can also be used for starting subprocesses, but you should probably only
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280 use them if you can't find any way to do what you need with the
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281 higher-level functions.
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282
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283 @DOCSTRING(system)
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284
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285 @DOCSTRING(unix)
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286
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287 @DOCSTRING(dos)
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288
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289 @DOCSTRING(perl)
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290
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291 @DOCSTRING(popen)
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292
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293 @DOCSTRING(pclose)
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294
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295 @DOCSTRING(popen2)
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296
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297 @DOCSTRING(EXEC_PATH)
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298
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299 In most cases, the following functions simply decode their arguments and
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300 make the corresponding Unix system calls. For a complete example of how
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301 they can be used, look at the definition of the function @code{popen2}.
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302
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303 @DOCSTRING(fork)
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304
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305 @DOCSTRING(exec)
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306
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307 @DOCSTRING(pipe)
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308
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309 @DOCSTRING(dup2)
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310
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311 @DOCSTRING(waitpid)
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312
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313 @DOCSTRING(WCONTINUE)
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314
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315 @DOCSTRING(WCOREDUMP)
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316
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317 @DOCSTRING(WEXITSTATUS)
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318
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319 @DOCSTRING(WIFCONTINUED)
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320
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321 @DOCSTRING(WIFSIGNALED)
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322
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323 @DOCSTRING(WIFSTOPPED)
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324
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325 @DOCSTRING(WIFEXITED)
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326
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327 @DOCSTRING(WNOHANG)
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328
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329 @DOCSTRING(WSTOPSIG)
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330
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331 @DOCSTRING(WTERMSIG)
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332
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333 @DOCSTRING(WUNTRACED)
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334
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335 @DOCSTRING(fcntl)
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336
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337 @DOCSTRING(kill)
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338
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339 @DOCSTRING(SIG)
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340
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341 @node Process ID Information
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342 @section Process, Group, and User IDs
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343
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344 @DOCSTRING(getpgrp)
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345
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346 @DOCSTRING(getpid)
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347
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348 @DOCSTRING(getppid)
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349
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350 @DOCSTRING(geteuid)
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351
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352 @DOCSTRING(getuid)
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353
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354 @DOCSTRING(getegid)
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355
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356 @DOCSTRING(getgid)
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357
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358 @node Environment Variables
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359 @section Environment Variables
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360
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361 @DOCSTRING(getenv)
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362
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363 @DOCSTRING(putenv)
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364
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365 @node Current Working Directory
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366 @section Current Working Directory
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367
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368 @DOCSTRING(cd)
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369
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370 @DOCSTRING(ls)
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371
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372 @DOCSTRING(ls_command)
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373
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374 @DOCSTRING(dir)
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375
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376 @DOCSTRING(pwd)
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377
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378 @node Password Database Functions
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379 @section Password Database Functions
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380
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381 Octave's password database functions return information in a structure
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382 with the following fields.
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383
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384 @table @code
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385 @item name
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386 The user name.
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387
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388 @item passwd
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389 The encrypted password, if available.
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390
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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391 @item uid
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392 The numeric user id.
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393
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394 @item gid
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395 The numeric group id.
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396
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397 @item gecos
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398 The GECOS field.
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399
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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400 @item dir
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401 The home directory.
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402
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403 @item shell
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404 The initial shell.
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405 @end table
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406
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407 In the descriptions of the following functions, this data structure is
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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408 referred to as a @var{pw_struct}.
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409
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410 @DOCSTRING(getpwent)
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411
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412 @DOCSTRING(getpwuid)
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413
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414 @DOCSTRING(getpwnam)
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415
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416 @DOCSTRING(setpwent)
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417
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418 @DOCSTRING(endpwent)
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419
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420 @node Group Database Functions
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421 @section Group Database Functions
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422
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423 Octave's group database functions return information in a structure
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424 with the following fields.
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425
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426 @table @code
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427 @item name
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428 The user name.
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429
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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430 @item passwd
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431 The encrypted password, if available.
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432
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433 @item gid
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434 The numeric group id.
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435
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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436 @item mem
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437 The members of the group.
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438 @end table
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439
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440 In the descriptions of the following functions, this data structure is
bfe1573bd2ae [project @ 1999-10-19 10:06:07 by jwe]
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441 referred to as a @var{grp_struct}.
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442
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443 @DOCSTRING(getgrent)
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444
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445 @DOCSTRING(getgrgid)
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446
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447 @DOCSTRING(getgrnam)
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448
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449 @DOCSTRING(setgrent)
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450
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451 @DOCSTRING(endgrent)
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452
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453 @node System Information
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454 @section System Information
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455
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456 @DOCSTRING(computer)
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457
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diff changeset
458 @DOCSTRING(uname)
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diff changeset
459
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diff changeset
460 @DOCSTRING(ispc)
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diff changeset
461
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diff changeset
462 @DOCSTRING(isunix)
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diff changeset
463
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diff changeset
464 @DOCSTRING(ismac)
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diff changeset
465
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466 @DOCSTRING(isieee)
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467
6623
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468 @DOCSTRING(OCTAVE_HOME)
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jwe
parents: 6550
diff changeset
469
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diff changeset
470 @DOCSTRING(matlabroot)
3294
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471
12288
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diff changeset
472 @DOCSTRING(OCTAVE_VERSION)
8286
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diff changeset
473
6623
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parents: 6550
diff changeset
474 @DOCSTRING(version)
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parents: 6550
diff changeset
475
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parents: 6550
diff changeset
476 @DOCSTRING(ver)
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jwe
parents: 6550
diff changeset
477
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diff changeset
478 @DOCSTRING(compare_versions)
f07e6b4d34c7 Add function compare_versions to documentation.
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parents: 11535
diff changeset
479
f07e6b4d34c7 Add function compare_versions to documentation.
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parents: 11535
diff changeset
480 @DOCSTRING(license)
f07e6b4d34c7 Add function compare_versions to documentation.
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parents: 11535
diff changeset
481
3301
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diff changeset
482 @DOCSTRING(octave_config_info)
3294
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jwe
parents:
diff changeset
483
3301
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diff changeset
484 @DOCSTRING(getrusage)
6702
b2391d403ed2 [project @ 2007-06-12 21:39:26 by dbateman]
dbateman
parents: 6623
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485
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486 @node Hashing Functions
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487 @section Hashing Functions
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488
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489 It is often necessary to find if two strings or files are
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490 identical. This might be done by comparing them character by character
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491 and looking for differences. However, this can be slow, and so comparing
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492 a hash of the string or file can be a rapid way of finding if the files
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493 differ.
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494
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495 Another use of the hashing function is to check for file integrity. The
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496 user can check the hash of the file against a known value and find if
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497 the file they have is the same as the one that the original hash was
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498 produced with.
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499
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500 Octave supplies the @code{md5sum} function to perform MD5 hashes on
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501 strings and files. An example of the use of @code{md5sum} function might
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502 be
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503
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504 @example
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505 @group
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506 if exist (file, "file")
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507 hash = md5sum (file);
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508 else
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509 # Treat the variable "file" as a string
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510 hash = md5sum (file, true);
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511 endif
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512 @end group
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513 @end example
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514
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515 @DOCSTRING(md5sum)