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$ cpio --list -i <td.cpio
.
...
t3
1 block
$

#!/opt/ActivePerl-5.12/bin/perl
use Archive::Cpio;
...
$cpio->read('td.cpio');
$cpio->remove('t1');
$cpio->write('tdnew.cpio');

sub remove {
    my ($cpio, @filenames) = @_;
...
    my %filenames = map { $_ => 1 } @filenames;
    @{$cpio->{list}} = grep { !$filenames{$_} } @{$cpio->{list}};
}