Hi Jon, As is standard with other buitins, umask is documented at `help umask`:
chris@gopher:~$ help umask
umask: umask [-p] [-S] [mode]
Display or set file mode mask.
Sets the user file-creation mask to MODE. If MODE is omitted, prints
the current value of the mask.
If MODE begins with a digit, it is interpreted as an octal number;
otherwise it is a symbolic mode string like that accepted by chmod(1).
Options:
-p if MODE is omitted, output in a form that may be reused as input
-S makes the output symbolic; otherwise an octal number is output
Exit Status:
Returns success unless MODE is invalid or an invalid option is given.
The umask builtin is also documented in `man bash`.
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