10.0
10.1
11.0
11.1
11.2
11.3
12.0
12.1
6.0
6.1
6.2
6.2.0
6.2.0-rc1
6.2.0-rc2
6.3
6.3-rc1
6.3-rc2
6.3-rc3
7.10
7.4
7.5
7.6
7.6-blfs
7.6-systemd
7.7
7.8
7.9
8.0
8.1
8.2
8.3
8.4
9.0
9.1
basic
bdubbs/svn
elogind
gnome
initial-import
kde5-13430
kde5-14269
kde5-14686
kea
ken/TL2024
ken/inkscape-core-mods
ken/tuningfonts
krejzi/svn
lazarus
lxqt
nosym
perl-modules
plabs/newcss
plabs/python-mods
python3.11
qt5new
rahul/power-profiles-daemon
renodr/vulkan-addition
reorg
systemd-11177
systemd-13485
trunk
upgradedb
v1_0
v5_0
v5_0-pre1
v5_1
v5_1-pre1
xry111/intltool
xry111/llvm18
xry111/soup3
xry111/test-20220226
xry111/xf86-video-removal
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Last change
on this file since f45b1953 was f45b1953, checked in by Mark Hymers <markh@…>, 22 years ago |
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Initial revision
git-svn-id: svn://svn.linuxfromscratch.org/BLFS/trunk/BOOK@3 af4574ff-66df-0310-9fd7-8a98e5e911e0
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| 1 | <sect1 id="ch05-which">
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| 2 | <?dbhtml filename="which.html" dir="chapter05"?>
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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" but
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| 18 | doesn't spawn a shell.</para>
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| 19 |
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| 20 | <para>The second option is to create a simple script:</para>
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| 21 | <para><screen><userinput>cat > /usr/bin/which << "EOF"</userinput>
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| 22 | #!/bin/bash
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| 23 | type -p "$@"
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| 24 | <userinput>EOF
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| 25 | chmod 755 /usr/bin/which
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| 26 | chown root.root /usr/bin/which</userinput></screen></para>
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| 27 | <para>This should generally work OK and is probably the easiest solution
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| 28 | for boxes which don't need a good user environment to work in.</para>
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| 29 |
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| 30 | <para>The third option is to install the actual program
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| 31 | <emphasis>which</emphasis>.</para>
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| 32 |
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| 33 | &which;
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| 34 |
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| 35 | </sect1>
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| 36 |
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