su - user -c 'command' behaves differently Post: 302453212

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pam_umask

PAM_UMASK(8)							 Linux-PAM Manual						      PAM_UMASK(8)

NAME

       pam_umask - PAM module to set the file mode creation mask

SYNOPSIS

       pam_umask.so [debug] [silent] [usergroups] [umask=mask]

DESCRIPTION

       pam_umask is a PAM module to set the file mode creation mask of the current environment. The umask affects the default permissions assigned
       to newly created files.

       The PAM module tries to get the umask value from the following places in the following order:

       o   umask= argument

       o   umask= entry of the users GECOS field

       o   pri= entry of the users GECOS field

       o   ulimit= entry of the users GECOS field

       o   UMASK= entry from /etc/default/login

       o   UMASK entry from /etc/login.defs

OPTIONS

       debug
	   Print debug information.

       silent
	   Don't print informative messages.

       usergroups
	   If the user is not root and the username is the same as primary group name, the umask group bits are set to be the same as owner bits
	   (examples: 022 -> 002, 077 -> 007).

       umask=mask
	   Sets the calling process's file mode creation mask (umask) to mask & 0777. The value is interpreted as Octal.

MODULE TYPES PROVIDED

       Only the session type is provided.

RETURN VALUES

       PAM_SUCCESS
	   The new umask was set successfully.

       PAM_SERVICE_ERR
	   No username was given.

       PAM_USER_UNKNOWN
	   User not known.

EXAMPLES

       Add the following line to /etc/pam.d/login to set the user specific umask at login:

		   session optional pam_umask.so umask=0022

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>.

Linux-PAM Manual						    06/04/2011							      PAM_UMASK(8)

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