No need to sort, given your description of the problem.

my @found;
while( <file> ) {
    next unless m/text2/; # Reject disqualified lines quickly.
    m/\s+(\d+)/ or die "Unexpected data format at file line $.\n";
    push @found, $1;
}

[download]

Dave

In reply to Re: search a large text file by davido
in thread search a large text file by perl_lover_always

Title:
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