my $fil="/dir/fil.gz";
open IN,"gunzip -c $fil |" or die $!;
open IN,"gzip -dc $fil |" or die $!;
my $out="/dir/out.gz";
open OUT,"| gzip >$out" or die $!;
my $fil="/dir/fil.gz";
open IN,"gunzip -c $fil |" or die $!;
open IN,"gzip -dc $fil |" or die $!;
my $out="/dir/out.gz";
open OUT,"| gzip >$out" or die $!;