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From: preece%xenurus@gswd-vms.Gould.COM (Scott E. Preece)
Newsgroups: comp.unix.wizards
Subject: umask and multiple groups
Message-ID: <10265@brl-adm.ARPA>
Date: Tue, 10-Nov-87 12:02:39 EST
Article-I.D.: brl-adm.10265
Posted: Tue Nov 10 12:02:39 1987
Date-Received: Thu, 12-Nov-87 21:02:39 EST
Sender: news@brl-adm.ARPA
Lines: 32

What I've done is to make my umask change as I change directories.
Thanks to aliases, this is no big deal.  I do all my directory movement
through aliased commands, which do things like remembering the last
directory I was in, changing my prompt to show the directory I'm in,
and set the umask.  I only use two umasks, one for directories in my
home tree and one for anything else, but it would be trivial to check
for other paths and set appropriate umasks (or check the gid of the
target directory and key off that).

The umask manipulation is done by the um command in each of the actual
directory-changing aliases.  The dirs command is there for the benefit
of GNU emacs shell sessions. The prompthead variable is assumed to have
been set somewhere up above (I usually use the name of the machine the
session is on, with highlighting around it tailored to the terminal I'm
using).

set prompt="$prompthead$cwd:t>"
alias um 'eval umask 2`if ("$cwd" =~ *${user}*) echo 2`'
alias back 'set back=$old; set old=$cwd; cd $back; um; unset back'
umask 022
alias cd ' set old=$cwd;chdir \!*; um; set prompt="$prompthead$cwd:t>"; dirs'
alias ">" ' pushd \!*; um; set prompt="$prompthead$cwd:t>"; dirs'
alias "<" ' popd; um; set prompt="$prompthead$cwd:t>"; dirs'
alias ".." ' cd ..; um; set prompt="$prompthead$cwd:t>"'
alias mark 'set \!:1=`pwd`; alias \!:1 cd $\!:1'
alias Mark mark \!:1 \; echo '>> ~/.cshrc' set \!:1 = `pwd` \\\; alias \!:1 cd '$'\!:1

-- 
scott preece
gould/csd - urbana
uucp:	ihnp4!uiucdcs!ccvaxa!preece
arpa:	preece@Gould.com