source: general/genutils/screen.xml@ 1d372050

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
   "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../../general.ent">
  %general-entities;

  <!ENTITY screen-download-http "&gnu-http;/screen/screen-&screen-version;.tar.gz">
  <!ENTITY screen-download-ftp  "&gnu-ftp;/screen/screen-&screen-version;.tar.gz">
  <!ENTITY screen-md5sum        "d276213d3acd10339cd37848b8c4ab1e">
  <!ENTITY screen-size          "836 KB">
  <!ENTITY screen-buildsize     "7.4 MB">
  <!ENTITY screen-time          "0.1 SBU">
]>

<sect1 id="screen" xreflabel="Screen-&screen-version;">
  <?dbhtml filename="screen.html"?>

  <sect1info>
    <date>$Date$</date>
  </sect1info>

  <title>Screen-&screen-version;</title>

  <indexterm zone="screen">
    <primary sortas="a-Screen">Screen</primary>
  </indexterm>

  <sect2 role="package">
    <title>Introduction to Screen</title>

    <para>
      <application>Screen</application> is a terminal multiplexor that runs
      several separate processes, typically interactive shells, on a single
      physical character-based terminal. Each virtual terminal emulates a DEC
      VT100 plus several ANSI X3.64 and ISO 2022 functions and also provides
      configurable input and output translation, serial port support,
      configurable logging, multi-user support, and many character encodings,
      including UTF-8. Screen sessions can be detached and resumed
      later on a different terminal.
    </para>

    &lfs101_checked;

    <bridgehead renderas="sect3">Package Information</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Download (HTTP): <ulink url="&screen-download-http;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download (FTP): <ulink url="&screen-download-ftp;"/>
        </para>
      </listitem>
      <listitem>
        <para>
          Download MD5 sum: &screen-md5sum;
        </para>
      </listitem>
      <listitem>
        <para>
          Download size: &screen-size;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated disk space required: &screen-buildsize;
        </para>
      </listitem>
      <listitem>
        <para>
          Estimated build time: &screen-time;
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Additional Downloads</bridgehead>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          Required patch:
          <ulink url="&patch-root;/screen-&screen-version;-upstream_fixes-1.patch"/>
        </para>
      </listitem>
    </itemizedlist>

    <bridgehead renderas="sect3">Screen Dependencies</bridgehead>

    <bridgehead renderas="sect4">Optional</bridgehead>
    <para role="optional">
      <xref linkend="linux-pam"/>
    </para>

    <para condition="html" role="usernotes">User Notes:
    <ulink url="&blfs-wiki;/screen"/></para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Screen</title>

    <para>
      First, apply a patch from upstream that fixes a security vulnerability:
    </para>

<screen><userinput remap="pre">patch -Np1 -i ../screen-&screen-version;-upstream_fixes-1.patch</userinput></screen>

    <para>
      Install <application>Screen</application> by running the
      following commands:
    </para>

<screen><userinput>./configure --prefix=/usr                     \
            --infodir=/usr/share/info         \
            --mandir=/usr/share/man           \
            --with-socket-dir=/run/screen     \
            --with-pty-group=5                \
            --with-sys-screenrc=/etc/screenrc &amp;&amp;

sed -i -e "s%/usr/local/etc/screenrc%/etc/screenrc%" {etc,doc}/* &amp;&amp;
make</userinput></screen>

    <para>
      This package does not come with a test suite.
    </para>

    <para>
      Now, as the <systemitem class="username">root</systemitem> user:
    </para>

<screen role="root"><userinput>make install &amp;&amp;
install -m 644 etc/etcscreenrc /etc/screenrc</userinput></screen>

  </sect2>

  <sect2 role="commands">
    <title>Command Explanations</title>

    <para>
      <parameter>--with-socket-dir=/run/screen</parameter>: This option
      places the per-user sockets in a standard location.
    </para>

    <para>
      <parameter>--with-sys-screenrc=/etc/screenrc</parameter>: This option
      places the global screenrc file in <filename
      class='directory'>/etc</filename>.
    </para>

    <para>
      <parameter>--with-pty-group=5</parameter>: This option sets the gid
      to the value used by LFS.
    </para>

    <para>
      <command>sed -i -e "s%/usr/local/etc/screenrc%/etc/screenrc%"
      {etc,doc}/*</command>: This command corrects the configuration and
      documentation files to the location that is used here for the global
      screenrc file.
    </para>

  </sect2>

  <sect2 role="configuration">
    <title>Configuring Screen</title>

    <sect3 id ="screen-config">
      <title>Config Files</title>

      <para>
        <filename>/etc/screenrc</filename> and
        <filename>~/.screenrc</filename>
      </para>

      <indexterm zone="screen screen-config">
        <primary sortas="e-AA.screenrc">~/.screenrc</primary>
      </indexterm>

      <indexterm zone="screen screen-config">
        <primary sortas="e-etc-screenrc">/etc/screenrc</primary>
      </indexterm>

    </sect3>

    <sect3>
      <title>Configuration Information</title>

      <para>
        You may want to look at the example configuration file that was
        installed and customize it for your needs.
      </para>

    </sect3>

  </sect2>

  <sect2 role="content">
    <title>Contents</title>

    <segmentedlist>
      <segtitle>Installed Program</segtitle>
      <segtitle>Installed Libraries</segtitle>
      <segtitle>Installed Directory</segtitle>

      <seglistitem>
        <seg>screen (symlink) and screen-&screen-version;</seg>
        <seg>None</seg>
        <seg>/usr/share/screen and /run/screen</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="screen-prog">
        <term><command>screen</command></term>
        <listitem>
          <para>
            is a terminal multiplexor with VT100/ANSI terminal emulation
          </para>
          <indexterm zone="screen screen-prog">
            <primary sortas="b-screen">screen</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>