use File::Spec::Functions; use File::Copy; our @files = glob "*.txt"; mkdir for qw( multiple single ); for my $file ( @files ) { if ( 1 > number_of_headers( $file ) ) { move( $file, catfile( "multiple", $file ) ); } else { move( $file, catfile( "single", $file ) ); } } sub number_of_headers { my $file = shift; my $count = () = slurp( $file ) =~ /FULL/g; return $count; } sub slurp { my $file = shift; local $/; local *SLURP; open SLURP, "<", $file or die "Couldn't open $file for reading: $!"; my $content = ; close SLURP or warn "Couldn't close $file: $!"; return $content; }