In article <nospam.News.Bob-3DD5EC.20413701032008@[EMAIL PROTECTED]
>,
Bob Harris <nospam.News.Bob@[EMAIL PROTECTED]
> wrote:
> In article <bob-4638D5.12045601032008@[EMAIL PROTECTED]
>,
> Robert Peirce <bob@[EMAIL PROTECTED]
> wrote:
>
> > In article <nospam.News.Bob-166AC4.20065929022008@[EMAIL PROTECTED]
>,
> > Bob Harris <nospam.News.Bob@[EMAIL PROTECTED]
> wrote:
> >
> > > In article <bob-A604BE.14425829022008@[EMAIL PROTECTED]
>,
> > > Robert Peirce <bob@[EMAIL PROTECTED]
> wrote:
> > >
> > > > data $1 |
> > > > tr : '\t' |
> > > > field 1 3 4 |
> > > > tail -200 |
> > > >
> > > > while read -r line
> > > > do print -r -- $line
> > > > done
> > >
> > > why not try
> > >
> > > data $1 | awk -F: '{print $1, $3, $4}' | tail -200
> >
> > No reason. I just tried to run the script as it sat. I figured I
would
> > worry about changing it once I got it working. Besides, this change
> > doesn't make the while loop work.
> >
> > The main question was why can't I pipe information into a ksh while
loop
> > on my Mac when I can do it on other Unix installations? This is made
> > more confusing to me by the fact that the following does work:
> >
> > . . .
> > tail -200 > tmp-file
> >
> > exec 0< tmp-file
> > while read -r line
> > . . .
> >
> > From my point of view, stdin is stdin and a pipe should work here.
>
> Well, why not try a different shell. For example instead of ksh,
> try bash or zsh. The 'while', the 'read' and the stdin
> redirection is a function of the shell. Perhaps it is your shell
> that is having problems.
Thanks, Bob, but that defeats the purpose of trying to figure out why
this doesn't work when it should. In an earlier version of this script
I used awk for everything. I switched to ksh because the built-ins
allowed me to do everything directly in the shell so I didn't have to
call other programs.
> If the behavior works with a different shell, then check the
> version of ksh on Mac OS X vs the other Unix systems you use. On
> Tiger I'm seeing:
> version sh (AT&T Labs Research) 1993-12-28 p
> and Leopard is showing:
> version sh (AT&T Research) 1993-12-28 s+
>
> Mac****ts says it has the following 2 versions of ksh
> ksh93 @[EMAIL PROTECTED]
shells/ksh93
> pdksh @[EMAIL PROTECTED]
shells/pdksh
>
> Bob Harris
The version I am running at the office is 1993-12-28 q. It is possible
the pipe-to-while capability was added in q and did not exist in p.
I found www.mac****ts.org, but I cannot figure out if there is a way just
to get ksh93 without installing the whole Mac****ts package, so I am
going to do that and try to get there version of ksh93.
--
Robert B. Peirce, Venetia, PA 724-941-6883
bob AT peirce-family.com [Mac]
rbp AT cooksonpeirce.com [Office]
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