execline
Software
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The umask program

umask changes its file mode creation mask, then executes a program. Alternatively, it can print the current mask.

Interface

     umask [ -S ] [ mask ] [ prog... ]

When called with no argument, umask prints the value of the file mode creation mask of the invoking process, then exits 0.

When called with a mask argument, umask changes its file mode creation mask; then, if prog... is not empty, it execs into it.

umask interprets mask as specified by the POSIX specification for a umask external utility.

Notes

• umask fully conforms to the POSIX specification. When prog... is not empty, the behaviour of a umask utility is not specified by POSIX, so umask extends the spec to be actually useful and usable in an execline program.