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From: corwin@bsu-cs.UUCP (Paul Frommeyer)
Newsgroups: comp.os.vms
Subject: Re: How do you ring bell in DCL file?
Message-ID: <581@bsu-cs.UUCP>
Date: Sun, 10-May-87 19:55:07 EDT
Article-I.D.: bsu-cs.581
Posted: Sun May 10 19:55:07 1987
Date-Received: Mon, 11-May-87 04:19:32 EDT
References: <154@siemens.UUCP> <312@skatter.UUCP>
Organization: CS Dept, Ball St U, Muncie, Indiana
Lines: 20
Summary: write sys$output "^G"

You must use either the SPECINS key in VAX EDT or the QUOTE function in
VAX TPU to enter the control characters. Just put them between double
quotes in a WRITE SYS$OUTPUT DCL command as you would normal text. I use
terminal control sequences extensively in my LOGIN.COM; clearing the
screen, setting VT240 colors, etc. However, you cannot do this:
	$ CLEAR :== WRITE SYS$OUTPUT "<ESC>[H<ESC>[J"
and then say
	$ CLEAR
because you will get an error message (either UNDEFSYM or IVVERB).
You must instead:
	$ CSYM :== "<ESC>[H<ESC>[J"
	$ CLEAR :== WRITE SYS$OUTPUT CSYM
which will do the job. This is also more efficient than something like:
	$ CLEAR :== @CLEARSCREEN


-- 
Paul "Corwin" Frommeyer        "Experience is no substitute for competence."
UUCP: 
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