The `umask` program

umask sets the umask (file creation mask), then executes a program.

Interface

     umask mask prog...

umask sets the current umask to mask, then execs into prog....

umask is a standard shell builtin. Be careful if you want to use the umask command outside of an execline script.
When execline has been configured with the --enable-pedantic-posix option, the umask binary is actually a symbolic link to the posix-umask binary.