$ perl -e '
    my $file = "pm_11157157_text";
    system cat => $file;
    my ($version) = do {
        open my $fh, "<", $file;
        <$fh> =~ /([0-9.]+.+$)/;
    };
    print "Version: $version\n";
'
# CentOS Linux release 7.6.1810 (Core)
Version: 7.6.1810 (Core)