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systemd/man/less-variables.xml
Zbigniew Jędrzejewski-Szmek 6432da6a69 basic/pager: ignore ^C when piping to less and K is not set
Normally, we want to immediately quit on ^C. But when we are running under
less, people may set SYSTEMD_LESS without K, in which case they can use ^C to
communicate with less, and e.g. start and stop following input.

Fixes #6405.
2018-11-14 16:53:50 +01:00

47 lines
2.1 KiB
XML

<?xml version="1.0"?>
<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
-->
<refsect1>
<title>Environment</title>
<variablelist class='environment-variables'>
<varlistentry id='pager'>
<term><varname>$SYSTEMD_PAGER</varname></term>
<listitem><para>Pager to use when <option>--no-pager</option> is not given; overrides
<varname>$PAGER</varname>. If neither <varname>$SYSTEMD_PAGER</varname> nor <varname>$PAGER</varname> are set, a
set of well-known pager implementations are tried in turn, including
<citerefentry project='man-pages'><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry> and
<citerefentry project='man-pages'><refentrytitle>more</refentrytitle><manvolnum>1</manvolnum></citerefentry>, until one is found. If
no pager implementation is discovered no pager is invoked. Setting this environment variable to an empty string
or the value <literal>cat</literal> is equivalent to passing <option>--no-pager</option>.</para></listitem>
</varlistentry>
<varlistentry id='less'>
<term><varname>$SYSTEMD_LESS</varname></term>
<listitem><para>Override the options passed to <command>less</command> (by default
<literal>FRSXMK</literal>).</para>
<para>If the value of <varname>$SYSTEMD_LESS</varname> does not include <literal>K</literal>,
and the pager that is invoked is <command>less</command>,
<keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> will be ignored by the
executable. This allows <command>less</command> to handle
<keycombo><keycap>Ctrl</keycap><keycap>C</keycap></keycombo> itself.</para></listitem>
</varlistentry>
<varlistentry id='lesscharset'>
<term><varname>$SYSTEMD_LESSCHARSET</varname></term>
<listitem><para>Override the charset passed to <command>less</command> (by default <literal>utf-8</literal>, if
the invoking terminal is determined to be UTF-8 compatible).</para></listitem>
</varlistentry>
</variablelist>
</refsect1>