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The umask controls the default file creation permissions, 0002 means files will have 664 and directories 775. Setting this (by editing the umask line at the bottom of /etc/profile in my case) means files created by one user will be writable by other users in the www-group without needing to chmod them.

I've looked that up, but I am told:

# The default umask is now handled by pam_umask.  
# See pam_umask(8) and /etc/login.defs.

And here I am blocked as I don't know pam_umask, I want to change the umask to 0002. How to?

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up vote 2 down vote accepted

From man 8 pam_umask:

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

You can change that value to 0002.

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