print "Num. Line : $. - Occ : $counter2\n";

##</code><code>##

unzip -p 10-million-combos.txt.zip | perlscript

##</code><code>##

$ unzip -p 10-million-combos.txt.zip | time grep -c 123456$
0
        3.30 real         3.25 user         0.01 sys
$ unzip -p 10-million-combos.txt.zip | time grep -c 123456$
0
        3.23 real         3.22 user         0.01 sys
$ unzip -p 10-million-combos.txt.zip | time grep -c 123456$
0
        3.18 real         3.17 user         0.01 sys

$ unzip -p 10-million-combos.txt.zip | time perl -ne 'BEGIN{$n=0} $n++ if /123456$/; END{print "$. lines, $n matches\n"}'
9835513 lines, 0 matches
        1.96 real         1.89 user         0.02 sys
$ unzip -p 10-million-combos.txt.zip | time perl -ne 'BEGIN{$n=0} $n++ if /123456$/; END{print "$. lines, $n matches\n"}'
9835513 lines, 0 matches
        1.96 real         1.93 user         0.02 sys
$ unzip -p 10-million-combos.txt.zip | time perl -ne 'BEGIN{$n=0} $n++ if /123456$/; END{print "$. lines, $n matches\n"}'
9835513 lines, 0 matches
        1.93 real         1.90 user         0.02 sys