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+pam_exec — PAM module which calls an external command
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+pam_exec is a PAM module that can be used to run an external command.
+
+The child's environment is set to the current PAM environment list, as returned
+by pam_getenvlist(3) In addition, the following PAM items are exported as
+environment variables: PAM_RHOST, PAM_RUSER, PAM_SERVICE, PAM_TTY, PAM_USER and
+PAM_TYPE, which contains one of the module types: account, auth, password,
+open_session and close_session.
+
+Commands called by pam_exec need to be aware of that the user can have control
+over the environment.
+
+OPTIONS
+
+debug
+
+    Print debug information.
+
+expose_authtok
+
+    During authentication the calling command can read the password from stdin
+    (3). Only first PAM_MAX_RESP_SIZE bytes of a password are provided to the
+    command.
+
+log=file
+
+    The output of the command is appended to file
+
+type=type
+
+    Only run the command if the module type matches the given type.
+
+stdout
+
+    Per default the output of the executed command is written to /dev/null.
+    With this option, the stdout output of the executed command is redirected
+    to the calling application. It's in the responsibility of this application
+    what happens with the output. The log option is ignored.
+
+quiet
+
+    Per default pam_exec.so will echo the exit status of the external command
+    if it fails. Specifying this option will suppress the message.
+
+seteuid
+
+    Per default pam_exec.so will execute the external command with the real
+    user ID of the calling process. Specifying this option means the command is
+    run with the effective user ID.
+
+EXAMPLES
+
+Add the following line to /etc/pam.d/passwd to rebuild the NIS database after
+each local password change:
+
+        password optional pam_exec.so seteuid /usr/bin/make -C /var/yp
+
+
+This will execute the command
+
+make -C /var/yp
+
+with effective user ID.
+
+AUTHOR
+
+pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de> and Josh Triplett
+<josh@joshtriplett.org>.
+