| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/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 at-download-http "http://ftp.de.debian.org/debian/pool/main/a/at/at_&at-version;.orig.tar.gz">
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| 8 | <!ENTITY at-download-ftp "ftp://ftp.de.debian.org/debian/pool/main/a/at/at_&at-version;.orig.tar.gz">
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| 9 | <!ENTITY at-md5sum "f0f96db22e3a174b53ce4beeeb848839">
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| 10 | <!ENTITY at-size "124 KB">
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| 11 | <!ENTITY at-buildsize "1.5 MB">
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| 12 | <!ENTITY at-time "less than 0.1 SBU">
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| 13 | ]>
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| 14 |
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| 15 | <sect1 id="at" xreflabel="Fcron-&at-version;">
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| 16 | <?dbhtml filename="at.html"?>
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| 17 |
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| 18 | <sect1info>
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| 19 | <othername>$LastChangedBy$</othername>
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| 20 | <date>$Date$</date>
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| 21 | </sect1info>
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| 22 |
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| 23 | <title>at-&at-version;</title>
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| 24 |
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| 25 | <indexterm zone="at">
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| 26 | <primary sortas="a-at">at</primary>
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| 27 | </indexterm>
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| 28 |
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| 29 | <sect2 role="package">
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| 30 | <title>Introduction to at</title>
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| 31 |
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| 32 | <para>The <application>at</application> package provide delayed job execution
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| 33 | and batch processing. It is required for Linux Standards Base (LSB)
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| 34 | conformance.</para>
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| 35 |
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| 36 | &lfs75_checked;
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| 37 |
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| 38 | <bridgehead renderas="sect3">Package Information</bridgehead>
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| 39 | <itemizedlist spacing="compact">
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| 40 | <listitem>
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| 41 | <para>Download (HTTP): <ulink url="&at-download-http;"/></para>
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| 42 | </listitem>
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| 43 | <listitem>
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| 44 | <para>Download (FTP): <ulink url="&at-download-ftp;"/></para>
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| 45 | </listitem>
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| 46 | <listitem>
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| 47 | <para>Download MD5 sum: &at-md5sum;</para>
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| 48 | </listitem>
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| 49 | <listitem>
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| 50 | <para>Download size: &at-size;</para>
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| 51 | </listitem>
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| 52 | <listitem>
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| 53 | <para>Estimated disk space required: &at-buildsize;</para>
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| 54 | </listitem>
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| 55 | <listitem>
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| 56 | <para>Estimated build time: &at-time;</para>
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| 57 | </listitem>
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| 58 | </itemizedlist>
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| 59 |
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| 60 | <bridgehead renderas="sect3">at Dependencies</bridgehead>
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| 61 |
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| 62 | <bridgehead renderas="sect4">Required</bridgehead>
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| 63 | <para role="required">
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| 64 | An <xref linkend="server-mail"/>
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| 65 | </para>
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| 66 |
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| 67 | <bridgehead renderas="sect4">Optional</bridgehead>
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| 68 | <para role="optional">
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| 69 | <xref linkend="linux-pam"/>
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| 70 | </para>
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| 71 |
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| 72 | <para condition="html" role="usernotes">User Notes:
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| 73 | <ulink url="&blfs-wiki;/at"/></para>
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| 74 |
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| 75 | </sect2>
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| 76 |
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| 77 | <sect2 role="installation">
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| 78 | <title>Installation of at</title>
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| 79 |
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| 80 | <note>
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| 81 | <para>
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| 82 | This package does not support parallel build.
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| 83 | </para>
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| 84 | </note>
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| 85 |
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| 86 | <para>Before building <application>at</application>, as the
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| 87 | <systemitem class="username">root</systemitem> user you should create
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| 88 | the group and user <systemitem class="username">atd</systemitem> which
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| 89 | will run the <command>atd</command> daemon. Also ensure the working
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| 90 | directory for the daemon exists:</para>
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| 91 |
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| 92 | <screen role="root"><userinput>groupadd -g 17 atd &&
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| 93 | useradd -d /dev/null -c "atd daemon" -g atd -s /bin/false -u 17 atd &&
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| 94 | mkdir -p /var/spool/cron</userinput></screen>
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| 95 |
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| 96 | <para>
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| 97 | Fix <filename>Makefile.in</filename> so that the documentation directory
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| 98 | is installed in the specified docdir:
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| 99 | </para>
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| 100 |
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| 101 | <screen><userinput>sed -i '/docdir/s/=.*/= @docdir@/' Makefile.in</userinput></screen>
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| 102 |
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| 103 | <para>Install <application>at</application> with the following
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| 104 | commands:</para>
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| 105 |
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| 106 | <screen><userinput>./configure --docdir=/usr/share/doc/at-&at-version; \
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| 107 | --with-daemon_username=atd \
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| 108 | --with-daemon_groupname=atd \
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| 109 | SENDMAIL=/usr/sbin/sendmail \
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| 110 | --with-systemdsystemunitdir=/lib/systemd/system &&
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| 111 | make -j1</userinput></screen>
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| 112 |
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| 113 | <para>This package does not come with a test suite.</para>
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| 114 |
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| 115 | <para>Now, as the <systemitem class="username">root</systemitem> user:</para>
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| 116 |
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| 117 | <screen role="root"><userinput>make install</userinput></screen>
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| 118 |
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| 119 | </sect2>
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| 120 |
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| 121 | <sect2 role="configuration">
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| 122 | <title>Configuring at</title>
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| 123 |
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| 124 | <sect3 id="at-config">
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| 125 | <title>Config Files</title>
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| 126 |
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| 127 | <para> <filename>/etc/at.allow</filename> and
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| 128 | <filename>/etc/at.deny</filename> determines who can submit jobs via at
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| 129 | or batch.</para>
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| 130 |
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| 131 | <indexterm zone="at at-config">
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| 132 | <primary sortas="e-etc-at.allow">/etc/at.allow</primary>
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| 133 | </indexterm>
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| 134 |
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| 135 | <indexterm zone="at at-config">
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| 136 | <primary sortas="e-etc-at.deny">/etc/at.deny</primary>
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| 137 | </indexterm>
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| 138 |
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| 139 | </sect3>
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| 140 |
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| 141 | <sect3 id="at-init">
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| 142 | <title>Systemd Units</title>
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| 143 |
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| 144 | <para>
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| 145 | To start the <command>atd</command> daemon at boot,
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| 146 | enable the previously installed systemd unit by
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| 147 | running the following command as the
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| 148 | <systemitem class="username">root</systemitem> user:
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| 149 | </para>
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| 150 |
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| 151 | <indexterm zone="at at-init">
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| 152 | <primary sortas="f-at">at</primary>
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| 153 | </indexterm>
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| 154 |
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| 155 | <screen role="root"><userinput>systemctl enable atd</userinput></screen>
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| 156 |
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| 157 | </sect3>
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| 158 |
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| 159 | </sect2>
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| 160 |
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| 161 | <sect2 role="content">
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| 162 | <title>Contents</title>
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| 163 |
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| 164 | <segmentedlist>
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| 165 | <segtitle>Installed Programs</segtitle>
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| 166 | <segtitle>Installed Libraries</segtitle>
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| 167 | <segtitle>Installed Directories</segtitle>
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| 168 |
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| 169 | <seglistitem>
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| 170 | <seg>at, atd, atq (symlink), atrm (symlink), atrun, and batch</seg>
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| 171 | <seg>None</seg>
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| 172 | <seg>
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| 173 | /var/spool/{atjobs,atspool} and
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| 174 | /usr/share/doc/at-&at-version;
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| 175 | </seg>
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| 176 | </seglistitem>
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| 177 | </segmentedlist>
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| 178 |
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| 179 | <variablelist>
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| 180 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 181 | <?dbfo list-presentation="list"?>
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| 182 | <?dbhtml list-presentation="table"?>
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| 183 |
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| 184 | <varlistentry id="at-prog">
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| 185 | <term><command>at</command></term>
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| 186 | <listitem>
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| 187 | <para>queues, examines or deletes jobs for later execution.</para>
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| 188 | <indexterm zone="at at-prog">
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| 189 | <primary sortas="b-at">at</primary>
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| 190 | </indexterm>
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| 191 | </listitem>
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| 192 | </varlistentry>
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| 193 |
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| 194 | <varlistentry id="atd">
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| 195 | <term><command>atd</command></term>
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| 196 | <listitem>
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| 197 | <para>is the daemon that runs jobs queued for later execution.</para>
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| 198 | <indexterm zone="at atd">
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| 199 | <primary sortas="b-atd">atd</primary>
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| 200 | </indexterm>
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| 201 | </listitem>
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| 202 | </varlistentry>
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| 203 |
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| 204 | <varlistentry id="atq">
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| 205 | <term><command>atq</command></term>
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| 206 | <listitem>
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| 207 | <para>lists the user's pending jobs, or all jobs, if superuser.</para>
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| 208 | <indexterm zone="at atq">
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| 209 | <primary sortas="b-atq">atq</primary>
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| 210 | </indexterm>
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| 211 | </listitem>
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| 212 | </varlistentry>
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| 213 |
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| 214 | <varlistentry id="atrm">
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| 215 | <term><command>atrm</command></term>
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| 216 | <listitem>
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| 217 | <para>deletes jobs, identified by their job number.</para>
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| 218 | <indexterm zone="at atrm">
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| 219 | <primary sortas="b-atrm">atrm</primary>
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| 220 | </indexterm>
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| 221 | </listitem>
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| 222 | </varlistentry>
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| 223 |
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| 224 | <varlistentry id="atrun">
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| 225 | <term><command>atrun</command></term>
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| 226 | <listitem>
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| 227 | <para>runs jobs queued for later execution.</para>
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| 228 | <indexterm zone="at atrun">
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| 229 | <primary sortas="b-atrun">atrun</primary>
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| 230 | </indexterm>
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| 231 | </listitem>
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| 232 | </varlistentry>
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| 233 |
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| 234 | <varlistentry id="batch">
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| 235 | <term><command>batch</command></term>
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| 236 | <listitem>
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| 237 | <para>is a script that executes commands when system load levels permit.
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| 238 | </para>
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| 239 | <indexterm zone="at batch">
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| 240 | <primary sortas="b-batch">batch</primary>
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| 241 | </indexterm>
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| 242 | </listitem>
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| 243 | </varlistentry>
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| 244 |
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| 245 | </variablelist>
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| 246 |
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| 247 | </sect2>
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| 248 |
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| 249 | </sect1>
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