'\" t
.\"     Title: pam_env.conf
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 09/03/2021
.\"    Manual: Linux-PAM Manual
.\"    Source: Linux-PAM Manual
.\"  Language: English
.\"
.TH "PAM_ENV\&.CONF" "5" "09/03/2021" "Linux-PAM Manual" "Linux\-PAM Manual"
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.SH "NAME"
pam_env.conf, environment \- the environment variables config files
.SH "DESCRIPTION"
.PP
The
/etc/security/pam_env\&.conf
file specifies the environment variables to be set, unset or modified by
\fBpam_env\fR(8)\&. When someone logs in, this file is read and the environment variables are set according\&.
.PP
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\&.
.PP
\fIVARIABLE\fR
[\fIDEFAULT=[value]\fR] [\fIOVERRIDE=[value]\fR]
.PP
(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\*(Aqt 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
\fIpasswd\fR
entry\&.
.PP
The "\fI#\fR" character at start of line (no space at front) can be used to mark this line as a comment line\&.
.PP
The
/etc/environment
file specifies the environment variables to be set\&. The file must consist of simple
\fINAME=VALUE\fR
pairs on separate lines\&. The
\fBpam_env\fR(8)
module will read the file after the
pam_env\&.conf
file\&.
.SH "EXAMPLES"
.PP
These are some example lines which might be specified in
/etc/security/pam_env\&.conf\&.
.PP
Set the REMOTEHOST variable for any hosts that are remote, default to "localhost" rather than not being set at all
.sp
.if n \{\
.RS 4
.\}
.nf
      REMOTEHOST     DEFAULT=localhost OVERRIDE=@{PAM_RHOST}
    
.fi
.if n \{\
.RE
.\}
.PP
Set the DISPLAY variable if it seems reasonable
.sp
.if n \{\
.RS 4
.\}
.nf
      DISPLAY        DEFAULT=${REMOTEHOST}:0\&.0 OVERRIDE=${DISPLAY}
    
.fi
.if n \{\
.RE
.\}
.PP
Now some simple variables
.sp
.if n \{\
.RS 4
.\}
.nf
      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\e
      :/usr/bin:/usr/local/bin/X11:/usr/bin/X11
      XDG_DATA_HOME  DEFAULT=@{HOME}/share/
    
.fi
.if n \{\
.RE
.\}
.PP
Silly examples of escaped variables, just to show how they work\&.
.sp
.if n \{\
.RS 4
.\}
.nf
      DOLLAR         DEFAULT=\e$
      DOLLARDOLLAR   DEFAULT=        OVERRIDE=\e$${DOLLAR}
      DOLLARPLUS     DEFAULT=\e${REMOTEHOST}${REMOTEHOST}
      ATSIGN         DEFAULT=""      OVERRIDE=\e@
    
.fi
.if n \{\
.RE
.\}
.SH "SEE ALSO"
.PP
\fBpam_env\fR(8),
\fBpam.d\fR(5),
\fBpam\fR(8),
\fBenviron\fR(7)
.SH "AUTHOR"
.PP
pam_env was written by Dave Kinchlea <kinch@kinch\&.ark\&.com>\&.