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From: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: Can't get eval to work like examples show
Message-ID: <977@cbmger.UUCP>
Date: 19 Mar 91 15:15:23 GMT
References: <7408.669349271@lemsys.UUCP>
Reply-To: peterk@cbmger.UUCP (Peter Kittel GERMANY)
Organization: Commodore Bueromaschinen GmbH, West Germany
Lines: 34

In article <7408.669349271@lemsys.UUCP> clemon@lemsys.UUCP (Craig Lemon) writes:
>
>	I have a need for eval to incriment an environment variable.  In
>the 1.3 manual it gives and example of how to use eval for this purpose :
>
>eval <env:loop >nil: to=t:qwe{$$} value2=1 op=-?
                                            ^^^^^ should be op=- ?
>	My version so far is
>
>eval <env:seq to=t:tmpval value2=1 op=+?
              ^>NIL:                ^^^^^ --> op=+ ?
>	It returns a 'bad arguments' error.  What's wrong?  I shouldn't
>NEED to direct output to nil: (then I wouldn't know that it didn't work!)

Well, two errors at once: First, you must separate the "?" with a space.
That should have caused that "bad arguments" error.
And then, you really NEED the ">NIL:", because this has to do just with
that "?": The "?" normally tells a command that you want help and ask it 
to display the command template, and it prompts you for the result. Now
this approach is used to get one argument from input redirection. The "?"
evokes the template, but ">NIL:" sends the template output to India/Egypt,
and the command searches for the argument input which it gets delivered
by "<env:seq".

What you also mentioned (getting a process list without CRs), is really
difficult. Perhaps it gets easier with 2.0, but when it came to such
problems in back times, the only solution was always to resort to
EDIT (yuck) and struggle with it until I had the job done. EDIT is
really stone-age, but it is (under 1.3 and without ARexx) the only
editor capable of such filter jobs in scripts. 

-- 
Best regards, Dr. Peter Kittel  // E-Mail to  \\  Only my personal opinions... 
Commodore Frankfurt, Germany  \X/ {uunet|pyramid|rutgers}!cbmvax!cbmger!peterk