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Posting-Version: version B UNSW 1.1 19 Sep 1984; site csadfa.oz
Path: utzoo!linus!philabs!cmcl2!seismo!munnari!natmlab!dmscanb!csadfa!cwj
From: cwj@csadfa.oz
Newsgroups: net.sources
Subject: Lock your terminal for lunch
Message-ID: <39@csadfa.oz>
Date: Mon, 23-Sep-85 16:26:50 EDT
Article-I.D.: csadfa.39
Posted: Mon Sep 23 16:26:50 1985
Date-Received: Wed, 25-Sep-85 10:37:15 EDT
Organization: CS, Faculty of Military Studies, Uni of NSW, Duntroon, Aust
Lines: 23

Here is a reasonably safe way to lock your terminal for lunch,
for `csh' users.

It is immune to holding down the interrupt key,
and immune to attempts to suspend the program (^z),
because it grabs and ignores the former and has nullified the latter.
BUT it is still vulnerable to QUIT (^\) - and I don't know why!
("onintr -" is supposed to ignore all interrupts)

----------------------------------------------------------
#!/bin/csh
# lock terminal until password received
echo "TERMINAL LOCKED"
stty -echo susp '' dsusp ''
onintr -
while ("$< x" != 'YOUR_PASSWORD x')
  echo 'Please ---- ---, Chris is at lunch'
  echo -n '% '
end

# restore the terminal to a normal state
stty echo susp '^z' dsusp '^y'
----------------------------------------------------------


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