> On Fri, 11 Feb 2000 20:02:33 -0000 "Kenn Humborg" <kenn at bluetree.ie>
> wrote:
> | > sed 's/ *| */|/g' file | cat > file
>> | > surely ??
>> | Is that _guaranteed_ not to truncate 'file' before sed
> | reads it?
>well, yes it should do, because its handing the output to cat before being
piped back into itself . . . now of course thats down to how much info cat
can hold . . . but you certainly shouldn't see sed overwrite the file it's
trying to parse
--steve
> For extra fun, what happens if you try
> sed 's/ *| */|/g' file | cat >> file
> Once upon a time, when patches to the kernel weren't quite as stable, I
> used to run script, run the patch, close the shell and glance through the
> typescript to spot any problems. Except once I forgot Ctrl-D. For extra
> stupid points, use cat instead of less.....
> Paul
>
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