Nice exercise for Text::CSV fans:
use strict;
use warnings;
use Text::CSV;
my( $infile, $outfile, @cols ) = @ARGV;
print "Reading from $infile.\n";
print "Writing to $outfile.\n";
print "Target columns are @cols.\n";
open my $in, "<", $infile or die "Cannot open $infile: $!\n";
open my $out, ">", $outfile or die "Cannot open $outfile: $!\n";
$_-- for @cols; # correct column numbering
my $csv = Text::CSV->new( );
my $pipe = Text::CSV->new( { sep_char => '|' } );
my $tilde = Text::CSV->new( { sep_char => '~', eol => "\n" } );
while( my $line = $csv->getline( $in ) ) {
$pipe ->combine( @$line );
$tilde->combine( @$line[@cols], $pipe->string );
print $out $tilde->string;
}
close $out;
close $in;
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