10-14-2012
Environment Variables
1. The problem statement:
What is the mesg value set for your environment? If it is on, how would you turn off your current
session? How would you set it permanently?
3. The attempts at a solution :
Read Unix The textbook.
3rd chapter has many things like environment variables and ans setting value of a variable for our session or any subsequent session but nothing about "mesg" value.
I think its a typo cuz google also doesn't show any result about it.
also went through Operating System Concepts 8th edition
4. Punjab University College of Information technology, Lahore Punjab, Pakistan, Adeel Nisar, Operating systems :
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pam_env(8) BSD System Manager's Manual pam_env(8)
NAME
pam_env -- The Environment PAM module
SYNOPSIS
[service-name] function-class control-flag pam_env [options]
DESCRIPTION
The Environment PAM module supports the authentication and session management function classes. In terms of the function-class parameter,
these are ``auth'' and ``session'' respectively. The Environment PAM module has identical support for both supported function classes.
The Environment PAM module allows the setting and unsetting of environment variables. The use of previously set environment variables as
well as PAM_ITEMs such as PAM_RHOST is supported.
This module can also parse a file with simple KEY=VAL pairs on separate lines (/etc/environment by default). You can change the default file
to parse, with the envfile flag and turn it on or off by setting the readenv flag to 1 or 0 respectively.
The following options may be passed to this module:
conffile=/path/to/pam_env.conf
Indicate an alternative pam_env.conf style configuration file to override the default. This can be useful when different services
need different environments.
debug A lot of debug information will be printed to the system log.
envfile=/path/to/environment
Indicate an alternative environment file to override the default. This can be useful when different services need different envi-
ronments.
readenv=0|1
Turns on or off the reading of the file specified by envfile (0 is off, 1 is on). By default this option is on.
FILES
/etc/security/pam_env.conf The default configuration file.
/etc/environment The default environment file.
SEE ALSO
environ(7), pam.conf(5), pam(8)
AUTHORS
The pam_env module was written by Dave Kinchlea <kinch@kinch.ark.com>.
BSD
February 7, 2009 BSD