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Re: bash script problem ?

Cross-posted to 3 groups.

Followups directed to: alt.os.linux.slackware, comp.os.linux.misc, alt.os.linux.debian

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In article <>, Joe Beanfish <joebeanfish@nospam.duh> wrote: 

> On Thu, 10 Mar 2016 13:20:58 +0000, no.top.post wrote:
> > I want to launch from a bash script:
> >  xterm -e mc  <Path1> <Path2>
> > where <Path1> = dirname `head -1 /root/.mc/filepos |awk '{print $1}'`
> >  and  <Path2> = dirname `head -2 /root/.mc/filepos |awk '{print $1}' |
> >  tail -1`
> > 
> > I.e. the 1st token of the 1st & 2nd line of /root/.mc/filepos are args
> > of mc The following 4 lines fail:-
> >  Path1=dirname `head -1 /root/.mc/filepos |awk '{print $1}'`
> >  Path2=dirname `head -2 /root/.mc/filepos |awk '{print $1}' | tail -1`
> >  xterm -e mc `dirname $Path1`
> >  xterm -e mc `dirname $Path2`
> 
> Drop the extra dirname from the Path* assignment

OK, What was I doing there ?!
 You can peel-the-potato before OR after cooking; but not both.
> 
>  Path1=`head -1 /root/.mc/filepos |awk '{print $1}'`
>  Path2=`head -2 /root/.mc/filepos |awk '{print $1}' | tail -1`
>  xterm -e mc `dirname $Path1` `dirname $Path2`
> 
> You could simplify the commands a bit with
> 
>  Path1=`awk 'NR==1 {print $1;exit 0;}' /root/.mc/filepos`
>  Path2=`awk 'NR==2 {print $1;exit 0;}' /root/.mc/filepos`
>  xterm -e mc `dirname $Path1` `dirname $Path2`
OK: but 'awk punishes me'. Save human memory is best.
> 
> The dirname step could also be eliminated in awk but isn't worth
> the effort to make it robust when dirname is available.
 Correct: human effort is the criterium.
 
 Thanks.

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Re: bash script problem ? no.top.post@gmail.com - 2016-03-16 16:52 +0000

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