umask(2)umask(2)NAMEumask - set and get file creation mask
sets the process's file mode creation mask to cmask and returns the
previous value of the mask. Only the file access permission bits of
the masks are used.
The bits set in cmask specify which permission bits to turn off in the
mode of the created file, and should be specified using the symbolic
values defined in stat(5).
The following creates a file named in the current directory with per‐
missions so that the file can be written only by its owner, and can be
read or executed only by the owner or processes with group permission,
even though group write permission and all permissions for others are
passed in to
The previous value of the file mode creation mask is returned.
SEE ALSOmkdir(1), sh(1), mknod(1M), chmod(2), creat(2), mknod(2), open(2).