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Trying to convert shell script to Perl

by DS (Acolyte)
on Aug 05, 2002 at 19:54 UTC ( #187798=perlquestion: print w/replies, xml ) Need Help??

DS has asked for the wisdom of the Perl Monks concerning the following question:

Hello monks , I am converting an old shell script to perl , I came through this for loop but don't know how to exactlly do it in perl ..
for DIR in `ls -d [a-k]* lts mon [n-z]*` do if [ -d $DIR/bld ]; then cd $DIR/bld cbsfpfg.exe `echo "cbs"$DIR$RELEASE $DIR` cd ../.. fi done
not sure how to change the for loop.don't seem to work when I try :
my $DIR; for $DIR in `ls -d [a-k]* lts mon [n-z]*` do if (-d $DIR/bld){ system (qq(cd $DIR/bld)); system(qq(cbsfpfg.exe `echo "cbs"$DIR$RELEASE $DIR`)); system (qq(cd ../..)); } done

edited: Mon Aug 5 22:14:09 2002 by jeffa - title change (was: shell problem)

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Re: Trying to convert shell script to Perl
by DamnDirtyApe (Curate) on Aug 05, 2002 at 22:33 UTC

    For a more Perl-ish version, try something like this...

    use Cwd ; my $curr_dir = cwd ; opendir DIR , $curr_dir ; for my $DIR ( grep { /^[a-k]/ || /^lts$/ || /^mon$/ || /^[n-z]/ } readdir( DIR ) ) { if ( -d "$DIR/bld" ) { chdir "$DIR/bld" ; system 'cbsfpfg.exe', ( 'cbs' . $DIR . $RELEASE ), $DIR ; chdir $curr_dir ; } } closedir DIR ;

    Those who know that they are profound strive for clarity. Those who
    would like to seem profound to the crowd strive for obscurity.
                --Friedrich Nietzsche
Re: shell problem
by I0 (Priest) on Aug 05, 2002 at 20:31 UTC
    for $DIR (split/\s+/,`ls -d [a-k]* lts mon [n-z]*`){ if (-d "$DIR/bld"){ system (qq(cd $DIR/bld;cbsfpfg.exe `echo "cbs"$DIR$RELEASE $DI +R`)); } }
    Update: added split to better emulate shell script
      I don't think this approach will work any better than what the seeker posted. The problem is that the values being assigned to "$DIR" all have the line-termination character(s) attached (/[\r\n]+/), whereas this was not the case for the original shell script. You either have to "chomp $DIR" or else use the "opendir()" and "readdir()" calls, as demonstrated by DDA below.

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