All:
I am in the process of converting a lot of shell scripts to Perl. I am having a problem with the following:

#!/usr/bin/ksh
GrepList=`sed '/^ *$/d;/^#/d' traplist.in 2>/dev/null`
grep -ilF "$GrepList" out/do* 2>/dev/null | xargs -i mv {} ./capture 2
+>/dev/null
[download]

This isn't the entire script, but it is in a continual loop.
The mv is in a race condition that is beyond my control and the GrepList changes over time.

Some of the limitations of the shell script implementation are:
1. The item in the GrepList that matched isn't recorded
2. The grep fails if the string is wrapped (imbedded) newline

I came up with the following (with help from the CB) as a start (code doesn't exactly match)

#!/usr/bin/perl
my @checklist;
my @testfile;
my $rulenames;
open (FILE,"filename");
while (<FILE>) {
 next if ( $_ =~ /^ *$/ || $_ =~ /^#/ );
 push @checklist , $_;
}
chomp @checklist;
close (FILE);
my $GrepList = join '|', map "($_)", @checklist;

@ARGV = <*>;
if (@ARGV) {
 undef $/;
 while (<>) {
  $_ =~ s/\n//;
  next unless ($_ =~ /$GrepList/i);
  print "$ARGV : $+\n";
 }
}
[download]

The final product will store the time stamp of the traplist file and only update on change and fix the obvious errors, but I am more concerned with the raw functionality.

What I am trying to accomplish is the following:

Match on any item in list

Stop after first match

Remember what matched

Be as fast as possible using the least amount of resources (I know - you trade one for the other)

What I can't do is:

Slurp in the file

Build an ever increasing string

Make the assumption that the string won't wrap 3 or more lines (though unlikely)

I originally envisioned what I do when I do a word search. You scan using your finger until you come across a letter that starts a word you are looking for. You follow it until you get a match or until you realize it is a dead end. If it is a dead end, you keep on going having forgot everything that came before.

Unfortunately, I don't believe there is a way to tell RegEx to start paying attention on a partial match.

Any ideas?

Limbic~Region

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In reply to Shell Script Woes by Limbic~Region

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