umask man page on UNIXv7

umask man page on UNIXv7

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UMASK(2)							      UMASK(2)

NAME
       umask - set file creation mode mask

SYNOPSIS
       umask(complmode)

DESCRIPTION
       Umask  sets  a  mask  used  whenever  a	file is created by creat(2) or
       mknod(2): the actual mode (see chmod(2)) of the newly-created  file  is
       the  logical  and of the given mode and the complement of the argument.
       Only the low-order 9 bits of the mask (the  protection  bits)  partici‐
       pate.   In  other  words, the mask shows the bits to be turned off when
       files are created.

       The previous value of the mask is returned by the call.	The  value  is
       initially  0  (no  restrictions).   The mask is inherited by child pro‐
       cesses.

SEE ALSO
       creat(2), mknod(2), chmod(2)

ASSEMBLER
       (umask = 60.)
       sys umask; complmode

								      UMASK(2)

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