07-27-2008
umask
Hi,
I have a doubt on the umask values.
Why is the UMASK value is different from file and directory?
Suppose if the umask value is 0022. The file permissions for a newly created file is 644 and the file permissions for a newly created directory is 755.
My doubt is why can't it be the 755(same like directory) for file also?
How can I provide the execute permission (default) to a file through UMASK?
Thanks in advance.
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LEARN ABOUT CENTOS
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 in the user's GECOS field
o UMASK= entry from /etc/default/login
o UMASK entry from /etc/login.defs
The GECOS field is split on comma ',' characters. The module also in addition to the umask= entry recognizes pri= entry, which sets the
nice priority value for the session, and ulimit= entry, which sets the maximum size of files the processes in the session can create.
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(8)
AUTHOR
pam_umask was written by Thorsten Kukuk <kukuk@thkukuk.de>.
Linux-PAM Manual 09/19/2013 PAM_UMASK(8)