initial-import
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git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@3 af4574ff-66df-0310-9fd7-8a98e5e911e0
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1 | <sect1 id="which" xreflabel="which-&which-version;">
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2 | <?dbhtml filename="which.html" dir="general"?>
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3 | <title>The "which" program / script</title>
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4 |
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5 | <para>The presence / absence of the which program in the main LFS book
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6 | is probably one of the most contentious issues we have on the mailing
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7 | lists. It has resulted in at least one flame war in the recent past.
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8 | To hopefully put an end to this once and for all, we here present the
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9 | various options for equipping your system with "which".</para>
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10 |
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11 | <para>The first option is simply to use a bash alias:</para>
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12 | <screen>alias which='type -p'</screen>
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13 | <para>This command can be put in your
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14 | <filename>~/.bash_profile</filename> or <filename>~/.bashrc</filename>
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15 | file in order to be set up each time you log in (see man bash for more
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16 | information on the bash login files). This will not always work
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17 | however, for example it will fail when a program needs to use "which"
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18 | but
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19 | doesn't spawn a shell.</para>
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20 |
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21 | <para>The second option is to create a simple script:</para>
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22 | <para><screen><userinput>cat > /usr/bin/which <<
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23 | "EOF"</userinput>
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24 | #!/bin/bash
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25 | type -p "$@"
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26 | <userinput>EOF
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27 | chmod 755 /usr/bin/which
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28 | chown root.root /usr/bin/which</userinput></screen></para>
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29 | <para>This should generally work OK and is probably the easiest solution
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30 | for boxes which don't need a good user environment to work in.</para>
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31 |
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32 | <para>The third option is to install the actual program
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33 | <emphasis>which</emphasis>.</para>
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34 |
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35 | &which-intro;
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36 | &which-inst;
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37 | &which-desc;
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38 |
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39 | </sect1>
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40 |
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