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{{wrongtitle|title=umask}}
'''umask''' is a [[Unix- shell|shell]] command in [[Unix-like]] operating system environments. It is similar to [[chmod]] except that where the bits give permissions with chmod they remove them with umask eg chmod 744 ... 7 = rwx for u, 4 = r for g and 4 = r for o would be 0033 where the first 0 is an octal tag, 0 = rwx for u, 3 = no wx for g and 3 = no wx for g.