Date: Mon, 22 Jun 2009 14:57:42 -0400 (EDT) From: vogelke+unix@pobox.com (Karl Vogel) To: freebsd-questions@freebsd.org Subject: Re: Changing my login directory Message-ID: <20090622185742.E8677BEEB@kev.msw.wpafb.af.mil> In-Reply-To: <20090622091220.GA79438@ei.bzerk.org> (message from Ruben de Groot on Mon, 22 Jun 2009 11:12:20 %2B0200)
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>> On Mon, 22 Jun 2009 11:12:20 +0200,
>> Ruben de Groot <mail25@bzerk.org> said:
R> No need for any external programs. The following shell script [accepts
R> one key, no need to hit return]
R> % more readkey.sh
R> echo -n "Press any key: "
R> stty cbreak -echo
R> KEY=$(dd bs=1 count=1 2>/dev/null)
R> stty -cbreak echo
R> echo
R> echo "You pressed the \"$KEY\" key."
Advantages of grabchars:
* One program invocation, instead of running stty twice and dd once.
* NOT having to deal with vendor-specific stty crap on different Unixen,
which is a definite bite in the nether regions when trying to make
things work on Solaris and BSD.
* Erase/kill processing handled for you, so you can still do ^X or ^U
deletion if you're entering multiple characters.
* Handles mapping characters to upper/lowercase, timeouts, default
answers if return is hit, and limiting answers to given character
sets. For example, "grabchars -c 0123456789 -n2 -t10" get two numbers
with a 10-second timeout.
--
Karl Vogel I don't speak for the USAF or my company
Never do anything against conscience even if the state demands it.
--Albert Einstein
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