介紹

To set/unset environment variables

Usage

[Step 1]

rules for (un)setting of variables are taken from the config file /etc/security/pam_env.conf

預設那 File 係空的

[Step 2]

Second a file (Default: /etc/environment) with simple KEY=VAL pairs on separate lines will be read

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[Step 3]

Third it will read a user configuration file (Default: $HOME/.pam_environment)

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OPTIONS

1. conffile option (/etc/security/pam_env.conf)
2. envfile option (/etc/environment)
3. user_envfile option ($HOME/.pam_environment)

[2]

readenv=0|1

Turns on or off the reading of the file specified by envfile

[3]

user_readenv=0|1

By default this option is off

原因: user supplied environment variables in the PAM environment could affect behavior of subsequent modules in the stack without the consent of the system administrator