Re: [MLUG] perl, awk, sed, etc.

[Stephen Montgomery-Smith <EMAIL:PROTECTED>]

Mike Miller wrote:
> On Tue, 4 Dec 2007, Michael wrote:
>
> > > I very frequently call perl from the bash script to do various little 
> > > things, almost always regexp search/replace because that is what I know.
> >
> > Nothing wrong with that. Perl for short things and especially good for 
> > regexp stuff. Of course awk and sed can sometimes be good for small 
> > things too. :)
>
> On SOLARIS, awk and sed can both be limited or buggy.  The GNU versions 
> are clearly superior.  Example: awk can only count fields (NF) up to 
> something like 256, which is not enough!  sed also fails without warning 
> with long lines -- this bug is rather famous because it causes some 
> installation scripts to fail on SOLARIS.
>
> All I really know how to do with sed is search/replace, I just do it in 
> perl instead.  I feel much more confident that it will work and the code 
> will be portable to any system that has perl running.
>
> I do use gawk a lot (but not awk, though I believe these are identical 
> on a GNU/Linux system).  Mostly stuff like this:
>
> gawk -F'\t' '$4>3 {print $2" "$5}' file.in > file.out
>
> Mike
>
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One problem I found with sed is that they have different options on BSD 
and Linux.  So "sed -r" on Linux is "sed -E" on BSD.



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