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git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@19 af4574ff-66df-0310-9fd7-8a98e5e911e0
41 lines
1.5 KiB
XML
41 lines
1.5 KiB
XML
<sect1 id="which" xreflabel="which-&which-version;">
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<?dbhtml filename="which.html" dir="general"?>
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<title>The "which" program / script</title>
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<para>The presence / absence of the which program in the main LFS book
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is probably one of the most contentious issues we have on the mailing
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lists. It has resulted in at least one flame war in the recent past.
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To hopefully put an end to this once and for all, we here present the
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various options for equipping your system with "which".</para>
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<para>The first option is simply to use a bash alias:</para>
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<screen>alias which='type -p'</screen>
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<para>This command can be put in your
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<filename>~/.bash_profile</filename> or <filename>~/.bashrc</filename>
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file in order to be set up each time you log in (see man bash for more
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information on the bash login files). This will not always work
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however, for example it will fail when a program needs to use "which"
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but
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doesn't spawn a shell.</para>
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<para>The second option is to create a simple script:</para>
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<para><screen><userinput>cat > /usr/bin/which <<
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"EOF"</userinput>
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#!/bin/bash
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type -p "$@"
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<userinput>EOF
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chmod 755 /usr/bin/which
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chown root:root /usr/bin/which</userinput></screen></para>
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<para>This should generally work OK and is probably the easiest solution
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for boxes which don't need a good user environment to work in.</para>
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<para>The third option is to install the actual program
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<emphasis>which</emphasis>.</para>
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&which-intro;
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&which-inst;
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&which-desc;
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</sect1>
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