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field separator in Perl

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# 1  
Old 04-09-2009
field separator in Perl
is there a similar parameter you can set in perl like FS in awk?
I think I've read all the tutorials on the subject, but cannot get this map split and so on thing to work.
I need to sort a file by columns, eg. first, third, fifth...
The script I need to add this column sorting is this:
Code:
use strict;
use warnings;
open (_file_, "< path-to-file")  or  die "Failed to read file : $! ";
my @not_sorted = <_file_>; 
sub normalize {
   my $in = $_[0];
   $in = lc($in);
   $in =~ tr<aeiouū>
   <aeiouu>;
   $in =~ tr<abcdefghijklmnopqrsštuvwxyz>
   <\x01-\x1B>;
   return $in;
}
my @sorted  = sort{ normalize($a) cmp normalize($b) or $a cmp $b}  @not_sorted;
print @sorted;
close (_file_);

# 2  
Old 04-09-2009
Quote:
Originally Posted by ahsog
is there a similar parameter you can set in perl like FS in awk?
maybe you can find the answer when you type : perldoc perlvar
# 3  
Old 04-09-2009
thanks, I see i have some reading to do...
# 4  
Old 04-09-2009
i couldn't find it....

i recommend:

Code:
( @a_junk ) = split( /\|/, $line );

or whatever else other than pipe you need.
# 5  
Old 04-09-2009
for Perl 5.8, might be able to do so
Code:
# perl --help

Usage: perl [switches] [--] [programfile] [arguments]
......
  -a              autosplit mode with -n or -p (splits $_ into @F)
.....................................
  -F/pattern/     split() pattern for -a switch (//'s are optional)
.................
  -n              assume "while (<>) { ... }" loop around program
  -p              assume loop like -n but print line also, like sed

# 6  
Old 04-09-2009
Only on the command line is there a field seperator option, -F, you can use to tell split() where to split something. You use it in conjunction with the -a option.

In a script you have to define that yourself by providing the split function with an argument or allowing split to use its default argument, which is whitespace. See the split() function for more details.

Edit: looks like ghostdog already posted while I was finding the command line switches.
# 7  
Old 04-09-2009
thank you all, I'll give it a try tonight.
But how do I tell Perl which columns to work on? It is a latex file with tabular, thus having "&" as field separator. Is it something like "@1", "@2" etc.?
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