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<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id="pam_env.conf">
<refmeta>
<refentrytitle>pam_env.conf</refentrytitle>
<manvolnum>5</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv>
<refname>pam_env.conf</refname>
<refname>environment</refname>
<refpurpose>the environment variables config files</refpurpose>
</refnamediv>
<refsect1 id='pam_env.conf-description'>
<title>DESCRIPTION</title>
<para>
The <filename>/etc/security/pam_env.conf</filename> file specifies
the environment variables to be set, unset or modified by
<citerefentry><refentrytitle>pam_env</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
When someone logs in, this file is read and the environment
variables are set according.
</para>
<para>
Each line starts with the variable name, there are then two possible
options for each variable DEFAULT and OVERRIDE. DEFAULT allows an
administrator to set the value of the variable to some default
value, if none is supplied then the empty string is assumed. The
OVERRIDE option tells pam_env that it should enter in its value
(overriding the default value) if there is one to use. OVERRIDE is
not used, "" is assumed and no override will be done.
</para>
<para>
<replaceable>VARIABLE</replaceable>
[<replaceable>DEFAULT=[value]</replaceable>]
[<replaceable>OVERRIDE=[value]</replaceable>]
</para>
<para>
(Possibly non-existent) environment variables may be used in values
using the ${string} syntax and (possibly non-existent) PAM_ITEMs as well
as HOME and SHELL may be used in values using the @{string} syntax. Both
the $ and @ characters can be backslash escaped to be used as literal values
values can be delimited with "", escaped " not supported.
Note that many environment variables that you would like to use
may not be set by the time the module is called.
For example, ${HOME} is used below several times, but
many PAM applications don't make it available by the time you need it.
The special variables @{HOME} and @{SHELL} are expanded to the values
for the user from his <emphasis>passwd</emphasis> entry.
</para>
<para>
The "<emphasis>#</emphasis>" character at start of line (no space
at front) can be used to mark this line as a comment line.
</para>
<para>
The <filename>/etc/environment</filename> file specifies
the environment variables to be set. The file must consist of simple
<emphasis>NAME=VALUE</emphasis> pairs on separate lines.
The <citerefentry><refentrytitle>pam_env</refentrytitle><manvolnum>8</manvolnum></citerefentry>
module will read the file after the <filename>pam_env.conf</filename>
file.
</para>
</refsect1>
<refsect1 id="pam_env.conf-examples">
<title>EXAMPLES</title>
<para>
These are some example lines which might be specified in
<filename>/etc/security/pam_env.conf</filename>.
</para>
<para>
Set the REMOTEHOST variable for any hosts that are remote, default
to "localhost" rather than not being set at all
</para>
<programlisting>
REMOTEHOST DEFAULT=localhost OVERRIDE=@{PAM_RHOST}
</programlisting>
<para>
Set the DISPLAY variable if it seems reasonable
</para>
<programlisting>
DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY}
</programlisting>
<para>
Now some simple variables
</para>
<programlisting>
PAGER DEFAULT=less
MANPAGER DEFAULT=less
LESS DEFAULT="M q e h15 z23 b80"
NNTPSERVER DEFAULT=localhost
PATH DEFAULT=${HOME}/bin:/usr/local/bin:/bin\
:/usr/bin:/usr/local/bin/X11:/usr/bin/X11
XDG_DATA_HOME DEFAULT=@{HOME}/share/
</programlisting>
<para>
Silly examples of escaped variables, just to show how they work.
</para>
<programlisting>
DOLLAR DEFAULT=\$
DOLLARDOLLAR DEFAULT= OVERRIDE=\$${DOLLAR}
DOLLARPLUS DEFAULT=\${REMOTEHOST}${REMOTEHOST}
ATSIGN DEFAULT="" OVERRIDE=\@
</programlisting>
</refsect1>
<refsect1 id="pam_env.conf-see_also">
<title>SEE ALSO</title>
<para>
<citerefentry><refentrytitle>pam_env</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
<citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>
<refsect1 id="pam_env.conf-author">
<title>AUTHOR</title>
<para>
pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>.
</para>
</refsect1>
</refentry>
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