1 | <sect2><title>Short descriptions</title>
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2 |
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3 | <para><command>basename</command> strips any path and a given suffix from
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4 | the given file name.</para>
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5 |
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6 | <para><command>cat</command> concatenates files to standard output.</para>
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7 |
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8 | <para><command>chgrp</command> changes the group ownership of each given
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9 | file to the given group. The group can be either given a a name or a numeric
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10 | ID.</para>
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11 |
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12 | <para><command>chmod</command> changes the permissions of each given file
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13 | to the given mode. The mode can be either a symbolic representation of the
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14 | changes to make, or an octal number representing the new permissions.</para>
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15 |
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16 | <para><command>chown</command> changes the user and/or group ownership of
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17 | each given file to the given user:group pair.</para>
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18 |
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19 | <para><command>chroot</command> runs a given command with the specified
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20 | directory as the <filename>/</filename> directory. The given command can be an
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21 | interactive shell. On most systems only <emphasis>root</emphasis> can do
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22 | this.</para>
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23 |
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24 | <para><command>cksum</command> prints the CRC checksum and the byte
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25 | counts of each specified file.</para>
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26 |
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27 | <para><command>comm</command> compares two sorted files, outputting in
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28 | three columns the lines that are unique, and the lines that are common.</para>
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29 |
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30 | <para><command>cp</command> copies files.</para>
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31 |
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32 | <para><command>csplit</command> splits a given file into several new files,
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33 | separating them according to given patterns or line numbers, and outputting
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34 | the byte count of each new file.</para>
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35 |
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36 | <para><command>cut</command> prints parts of lines, selecting the parts
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37 | according to given fields or positions.</para>
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38 |
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39 | <para><command>date</command> displays the current time in the given
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40 | format, or sets the system date.</para>
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41 |
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42 | <para><command>dd</command> copies a file using the given blocksize and
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43 | count, while optionally performing conversions on it.</para>
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44 |
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45 | <para><command>df</command> reports the amount of disk space available
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46 | (and used) on all mounted file systems, or only on the file systems holding the
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47 | given files.</para>
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48 |
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49 | <para><command>dir</command> is the same as ls.</para>
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50 |
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51 | <para><command>dircolors</command> outputs commands to set the LS_COLOR
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52 | environment variable, to change the color scheme used by ls.</para>
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53 |
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54 | <para><command>dirname</command> strips the non-directory suffix from
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55 | a given file name.</para>
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56 |
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57 | <para><command>du</command> reports the amount of disk space used by the
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58 | current directory, or by each of the given directories including all their
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59 | subdirectories, or by each of the given files.</para>
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60 |
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61 | <para><command>echo</command> displays the given strings.</para>
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62 |
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63 | <para><command>env</command> runs a command in a modified environment.</para>
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64 |
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65 | <para><command>expand</command> converts tabs to spaces.</para>
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66 |
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67 | <para><command>expr</command> evaluates expressions.</para>
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68 |
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69 | <para><command>factor</command> prints the prime factors of all specified
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70 | integer numbers.</para>
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71 |
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72 | <para><command>false</command> does nothing, unsuccessfully. It always
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73 | exits with a status code indicating failure.</para>
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74 |
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75 | <para><command>fmt</command> reformats the paragraphs in the given files.</para>
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76 |
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77 | <para><command>fold</command> wraps the lines in the given files.</para>
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78 |
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79 | <para><command>groups</command> reports a user's group memberships.</para>
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80 |
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81 | <para><command>head</command> prints the first ten lines (or the given
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82 | number of lines) of each given file.</para>
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83 |
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84 | <para><command>hostid</command> reports the numeric identifier
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85 | (in hexadecimal) of the host.</para>
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86 |
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87 | <para><command>hostname</command> reports or sets the name of the
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88 | host.</para>
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89 |
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90 | <para><command>id</command> reports the effective user ID, group ID, and
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91 | group memberships of the current user, or of a given user.</para>
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92 |
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93 | <para><command>install</command> copies files while setting their
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94 | permission modes and, if possible, their owner and group.</para>
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95 |
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96 | <para><command>join</command> joins from two files the lines that have
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97 | identical join fields.</para>
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98 |
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99 | <para><command>link</command> creates a hard link with the given name
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100 | to the given file.</para>
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101 |
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102 | <para><command>ln</command> makes hard links or soft links between files.</para>
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103 |
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104 | <para><command>logname</command> reports the current user's login name.</para>
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105 |
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106 | <para><command>ls</command> lists the contents of each given directory.
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107 | By default it orders the files and subdirectories alphabetically.</para>
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108 |
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109 | <para><command>md5sum</command> reports or checks MD5 checksums.</para>
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110 |
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111 | <para><command>mkdir</command> creates directories with the given names.</para>
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112 |
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113 | <para><command>mkfifo</command> creates FIFOs with the given names.</para>
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114 |
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115 | <para><command>mknod</command> creates device nodes with the given names.
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116 | A device node is a character special file, or a block special file, or a FIFO.</para>
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117 |
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118 | <para><command>mv</command> moves or renames files or directories.</para>
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119 |
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120 | <para><command>nice</command> runs a program with modified scheduling priority.</para>
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121 |
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122 | <para><command>nl</command> numbers the lines from the given files.</para>
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123 |
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124 | <para><command>nohup</command> runs a command immune to hangups, with
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125 | output redirected to a log file.</para>
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126 |
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127 | <para><command>od</command> dumps files in octal and other formats.</para>
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128 |
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129 | <para><command>paste</command> merges the given files, joining
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130 | sequentially corresponding lines side by side, separated by TABs.</para>
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131 |
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132 | <para><command>pathchk</command> checks whether file names are valid
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133 | or portable.</para>
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134 |
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135 | <para><command>pinky</command> is a lightweight finger. It reports
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136 | some information about the given users.</para>
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137 |
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138 | <para><command>pr</command> paginates and columnates files for printing.</para>
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139 |
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140 | <para><command>printenv</command> prints the environment.</para>
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141 |
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142 | <para><command>printf</command> prints the given arguments according to the
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143 | given format -- much like the C printf function.</para>
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144 |
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145 | <para><command>ptx</command> produces from the contents of the given files
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146 | a permuted index, with each keyword in its context.</para>
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147 |
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148 | <para><command>pwd</command> reports the name of the current directory.</para>
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149 |
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150 | <para><command>readlink</command> reports the value of the given symbolic
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151 | link.</para>
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152 |
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153 | <para><command>rm</command> removes files or directories.</para>
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154 |
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155 | <para><command>rmdir</command> removes directories, if they are empty.</para>
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156 |
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157 | <para><command>seq</command> prints a sequence of numbers, within a given
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158 | range and with a given increment.</para>
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159 |
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160 | <para><command>sha1sum</command> prints or checks 160-bit SHA1
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161 | checksums.</para>
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162 |
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163 | <para><command>shred</command> overwrites the given files repeatedly with
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164 | strange patterns, to make it real hard to recover the data.</para>
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165 |
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166 | <para><command>sleep</command> pauses for the given amount of time.</para>
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167 |
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168 | <para><command>sort</command> sorts the lines from the given files.</para>
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169 |
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170 | <para><command>split</command> splits the given file into pieces, by size
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171 | or by number of lines.</para>
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172 |
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173 | <para><command>stty</command> sets or reports terminal line settings.</para>
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174 |
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175 | <para><command>su</command> runs a shell with substitute user and group IDs.</para>
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176 |
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177 | <para><command>sum</command> prints checksum and block counts for each
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178 | given file.</para>
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179 |
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180 | <para><command>sync</command> flushes file system buffers. It forces
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181 | changed blocks to disk and updates the super block.</para>
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182 |
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183 | <para><command>tac</command> concatenates the given files in reverse.</para>
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184 |
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185 | <para><command>tail</command> prints the last ten lines (or the given
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186 | number of lines) of each given file.</para>
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187 |
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188 | <para><command>tee</command> reads from standard input while writing both
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189 | to standard output and to the given files.</para>
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190 |
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191 | <para><command>test</command> compares values and checks file types.</para>
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192 |
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193 | <para><command>touch</command> changes file timestamps, setting the access
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194 | and modification times of the given files to the current time. Files that do
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195 | not exist are created with zero length.</para>
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196 |
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197 | <para><command>tr</command> translates, squeezes, and deletes the given
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198 | characters from standard input.</para>
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199 |
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200 | <para><command>true</command> does nothing, successfully. It always exits
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201 | with a status code indicating success.</para>
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202 |
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203 | <para><command>tsort</command> performs a topological sort. It writes a
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204 | totally ordered list according to the partial ordering in a given file.</para>
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205 |
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206 | <para><command>tty</command> reports the file name of the terminal
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207 | connected to standard input.</para>
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208 |
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209 | <para><command>uname</command> reports system information.</para>
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210 |
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211 | <para><command>unexpand</command> converts spaces to tabs.</para>
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212 |
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213 | <para><command>uniq</command> discards all but one of successive
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214 | identical lines.</para>
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215 |
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216 | <para><command>unlink</command> removes the given file.</para>
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217 |
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218 | <para><command>uptime</command> reports how long the system has been
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219 | running, how many users are logged on, and the system load averages.</para>
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220 |
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221 | <para><command>users</command> reports the names of the users currently
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222 | logged on.</para>
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223 |
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224 | <para><command>vdir</command> is the same as ls -l.</para>
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225 |
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226 | <para><command>wc</command> reports the number of lines, words, and bytes
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227 | for each given file, and a total line when more than one file is given.</para>
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228 |
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229 | <para><command>who</command> reports who is logged on.</para>
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230 |
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231 | <para><command>whoami</command> reports the user name associated with the
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232 | current effective user ID.</para>
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233 |
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234 | <para><command>yes</command> outputs 'y' or a given string repeatedly,
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235 | until killed.</para>
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236 |
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237 | </sect2>
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238 |
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