Adjusting UMASK items on a CentOS/RedHat system.

Open up /etc/bashrc:

sudo nano /etc/bashrc

Search through the code and find the chunk of code that looks something like this:

# By default, we want this to get set.
# Even for non-interactive, non-login shells.
if [ $UID -gt 99 ] && [ "`id -gn`" = "`id -un`" ]; then
        umask 002
else
        umask 022
fi

Change the umask value in the else logic to:

umask 002

Adjusting UMASK items on an Ubuntu/Debian system.

Open up /etc/profile:

sudo nano /etc/profile

The last line of the file should have a umask entry that reads as follows:

umask 022

Change the umask value to:

umask 002

If that line is not in the file, just add it to the file and save it.

Adjustments to the pam.d UMASK settings on an Ubuntu/Debian system.

Open up /etc/pam.d/common-session:

sudo nano /etc/pam.d/common-session

Find the line that reads something like this:

session optional                        pam_umask.so

Change it to this by adding umask=0002 to the end of the line:

session optional                        pam_umask.so    umask=0002