grep -P 'Z' file_to_search | awk '{print $1}' | sort | uniq --count > uniq.count

One perlish equivalent is

perl -ae '$s{$F[0]}++ if $F[1] eq "Z"; END {print "$_ $s{$_}\n" for ke
+ys %s}' file_to_search > uniq.count

[download]

See how the timings compare on your platform.

Edit: (TIMTOWTDI) s/The/One/

In reply to Re^3: Nested greps w/ Perl by hippo
in thread Nested greps w/ Perl by wackattack

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