From owner-freebsd-questions  Mon Dec 20 18:44:17 1999
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To: Ben Smithurst <ben@scientia.demon.co.uk>
Cc: Salihin <odhienx@arwana.untan.ac.id>, Dan Larsson <dl@tyfon.net>,
	"[FreeBSD-Questions-List] (E-post)" <freebsd-questions@freebsd.org>
Subject: Re: press any key to continue in sh 
In-reply-to: Your message of "Mon, 20 Dec 1999 23:18:02 GMT."
             <19991220231802.A540@strontium.scientia.demon.co.uk> 
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Date: Mon, 20 Dec 1999 20:44:33 -0600
From: Jon Hamilton <hamilton@pobox.com>
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In message <19991220231802.A540@strontium.scientia.demon.co.uk>, Ben Smithurst 
wrote:
} Salihin wrote:
} 
} > On Mon, 20 Dec 1999, Ben Smithurst wrote:
} > 
} >> Dan Larsson wrote:
} >> 
} >>> How do I best produce a 'press any key to continue' prompt in sh?
} >> 
} >> Try this:
} >> 
} >> echo "Press any key to continue..."
} >> perl -e 'system("stty", "cbreak"); getc(STDIN); system("stty", "-cbreak");
} '
} >> 
} > 
} > or...
} > /bin/sh -c "read -p \"Press CTRL+C to abort and ENTER to continue !\" _e"
} > ^^^^^^
} >      shell :-)
} 
} So show me YOUR solution which implements what Dan asked for - "press
} any key to continue", not "press ENTER to continue". :-)
} 
} Using perl may not be allowed, but it's the only way I can think of
} offhand. Unless Dan wants it implemented using shell builtin commands,
} I don't see anything wrong with my solution (higher overhead than I'd
} like, but still).

Well, this will be a little lower overhead and is more shell-ish:

#!/bin/sh

echon() {
  if [ -n "`echo -n`" ] ; then
    echo "$@\c"
  else
    echo -n "$@"
  fi
}

echon "Press any key to continue: "
TTYSTATE=`stty -g`
stty raw
dd if=/dev/tty of=/dev/null bs=1 count=1 > /dev/null 2>&1
stty "$TTYSTATE"
echo

It's only good for interactive use, which may be ok given its nature :)

-- 
   Jon Hamilton  
   hamilton@pobox.com



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