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open (DATAFILE3, $prog);
@lines = <DATAFILE3>;
...

$lines[76] =~ s/^(\S+\s+\S+).*/$1/;
print "$lines[76]><br>\n"

open (DATAFILE3, $prog);
while (<DATAFILE3>) {
...
# $line has the 76th line, do your stuff now.

close(DATAFILE3);