umask

• Subtract the umask from 7 to get the permissions that will result from a umask.
• For example, if a umask is 022, the result will be 755.
• The umask command is: umask.
• umask can be changed temporarily and can be added to bashrc.
• system-wide default umask (pam_umask) is set in /etc/login.defs for RHEL 8 and Debian 10.
• In older Linux distributions, this was set in bashrc or bash_profile.