My default shell is tcsh, but I don't think it matters that much, as umask is a shell builtin....or, maybe it does. Below is output from umask in tcsh, sh, csh ...
#umask
22
<admin@logger>[/home/logger] [12:18]
#sh
$ umask
0022
$ csh
You have mail.
<admin@logger> [/home/logger] [12:18]
#umask
22
To change your umask, simply add it as argument 1 to the umask command.
If you wish to change it more permanently, edit your .cshrc (csh/tcsh) or .profile (sh/bash) ... here's mine...
# A righteous umask
umask 22