1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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5 | %general-entities;
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6 |
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7 | <!ENTITY which-download-http "http://www.xs4all.nl/~carlo17/which/which-&which-version;.tar.gz">
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8 | <!ENTITY which-download-ftp "ftp://ftp.gnu.org/gnu/which/which-&which-version;.tar.gz">
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9 | <!ENTITY which-md5sum "830b83af48347a9a3520f561e47cbc9b">
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10 | <!ENTITY which-size "123 KB">
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11 | <!ENTITY which-buildsize "940 KB">
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12 | <!ENTITY which-time "0.03 SBU">
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13 | ]>
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14 |
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15 | <sect1 id="which" xreflabel="which-&which-version;">
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16 | <sect1info>
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17 | <othername>$LastChangedBy$</othername>
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18 | <date>$Date$</date>
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19 | </sect1info>
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20 | <?dbhtml filename="which.html"?>
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21 | <title><application>which</application>-&which-version; and alternatives</title>
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22 | <indexterm zone="which">
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23 | <primary sortas="a-Which">Which</primary></indexterm>
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24 |
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25 | <para>The presence or absence of the <command>which</command> program in the
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26 | main <acronym>LFS</acronym> book is probably one of the most contentious
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27 | issues on the mailing lists. It has resulted in at least one flame war in the
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28 | past. To hopefully put an end to this once and for all, presented here are two
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29 | options for equipping your system with <command>which</command>. The question
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30 | of which <quote><command>which</command></quote> is for you to decide.</para>
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31 |
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32 | <para>The first option is to install the actual <acronym>GNU</acronym> program
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33 | <emphasis>which</emphasis>.</para>
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34 |
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35 | <sect2>
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36 | <title>Introduction to <application>which</application></title>
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37 |
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38 | <sect3><title>Package information</title>
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39 | <itemizedlist spacing='compact'>
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40 | <listitem><para>Download (HTTP): <ulink
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41 | url="&which-download-http;"/></para></listitem>
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42 | <listitem><para>Download (FTP): <ulink
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43 | url="&which-download-ftp;"/></para></listitem>
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44 | <listitem><para>Download MD5 sum: &which-md5sum;</para></listitem>
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45 | <listitem><para>Download size: &which-size;</para></listitem>
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46 | <listitem><para>Estimated disk space required:
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47 | &which-buildsize;</para></listitem>
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48 | <listitem><para>Estimated build time:
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49 | &which-time;</para></listitem></itemizedlist>
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50 | </sect3>
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51 |
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52 | </sect2>
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53 |
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54 | <sect2>
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55 | <title>Installation of <application>which</application></title>
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56 |
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57 | <para>Install <application>which</application> by running the following
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58 | commands:</para>
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59 |
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60 | <screen><userinput><command>./configure --prefix=/usr &&
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61 | make</command></userinput></screen>
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62 |
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63 | <para>Now, as the root user:</para>
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64 |
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65 | <screen><userinput role='root'><command>make install</command></userinput></screen>
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66 |
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67 | </sect2>
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68 |
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69 | <sect2>
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70 | <title>Contents</title>
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71 |
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72 | <segmentedlist>
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73 | <segtitle>Installed Program</segtitle>
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74 | <segtitle>Installed Libraries</segtitle>
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75 | <segtitle>Installed Directories</segtitle>
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76 |
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77 | <seglistitem>
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78 | <seg>which</seg>
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79 | <seg>None</seg>
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80 | <seg>None</seg>
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81 | </seglistitem>
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82 | </segmentedlist>
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83 |
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84 | <variablelist>
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85 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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86 | <?dbfo list-presentation="list"?>
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87 |
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88 | <varlistentry id="which-prog">
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89 | <term><command>which</command></term>
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90 | <listitem><para>shows the full path of (shell) commands installed in your
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91 | <envar>PATH</envar>.</para>
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92 | <indexterm zone="which which-prog">
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93 | <primary sortas="b-which">which</primary>
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94 | </indexterm></listitem>
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95 | </varlistentry>
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96 | </variablelist>
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97 |
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98 | </sect2>
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99 |
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100 | <sect2>
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101 | <title>The 'which' script</title>
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102 | <para>The second option (for those who don't want to install the program)
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103 | is to create a simple script (execute as the root user):</para>
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104 |
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105 | <screen><userinput role='root'><command>cat > /usr/bin/which << "EOF"</command>
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106 | #!/bin/bash
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107 | type -pa "$@" | head -n 1 ; exit ${PIPESTATUS[0]}
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108 | <command>EOF
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109 | chmod 755 /usr/bin/which
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110 | chown root:root /usr/bin/which</command></userinput></screen>
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111 |
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112 | <para>This should work OK and is probably the easiest solution
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113 | for most cases, but is not the most comprehensive implementation.</para>
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114 | </sect2>
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115 |
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116 | </sect1>
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117 |
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