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From: meadb@boulder.Colorado.EDU (MEAD BENNETT ROSS)
Newsgroups: comp.sys.ncr,comp.unix.questions
Subject: Re: Odd vi behaviour inside a shell script.
Keywords: vi, sh, stderr, shell scripts
Message-ID: <20829@boulder.Colorado.EDU>
Date: 9 May 90 03:37:38 GMT
References: <1284@telsys.aut.UUCP> <438@ncrstp.StPaul.NCR.COM>
Sender: news@boulder.Colorado.EDU
Reply-To: meadb@tramp.Colorado.EDU (MEAD BENNETT ROSS)
Organization: University of Colorado, boulder
Lines: 29

In article <438@ncrstp.StPaul.NCR.COM> mercer@ncrstp.StPaul.NCR.COM (Dan Mercer) writes:
>In article <1284@telsys.aut.UUCP> jsmithso@aut.UUCP (Jim Smithson) writes:
>:...
>:So I enter the command:		foo.sh 2>&1 |tee foo.log
>:But this totally hoses up `vi`. `vi` runs fine if I enter: foo.sh |tee foo.log
>:But stderr is not written to the logfile. Same with: foo.sh | tee foo.log 2>&1
>:`vi` also runs fine if I enter: foo.sh 2>&1
>:  ...
>
>Vi uses stderr on the ioctl call that sets it up for raw data
>handling.  If stderr is redirected,  the terminal will not be in the 
>correct state,  and all the full screen algorithms will be off.  I
>know of no way around this.
> ...
 
Alright, I don't know what characters are echoed to the screen by ioctl,
but it shouldn't be hard to find out.  Write a C program that echos
these characters to stdout.  Not too bad, but it will require a little research,
and a little C knowledge.  Then put this C program in your shell script.  Not
trivial, but there are ways to get around this problem, but it will take
longer than just using ed.  (as suggested by Dan.)  But it looks like it's 
possible to do this.

			-Bennett.

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