If we can make the assumption that each file has the same number of lines, then the following should work:
#!/usr/bin/perl -w
use strict;
my %files;
my @infiles = qw(fileA fileB fileC);
for (@infiles) {
open IN, "<", $_ or die "Cannot open $_:$!\n";
chomp(@{$files{$_}} = <IN>);
close IN;
}
open OUT, ">", "fileD" or die "Cannot open fileD:$!\n";
for my $line (0 .. $#{$files{fileA}}) {
for my $file (@infiles) {
print OUT $files{$file}[$line];
}
print OUT "\n";
}
close OUT;
$ cat fileD
111AAAaaa
222BBBbbb
333CCCccc
Cheers,
Darren :)
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