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use constant { OUT_DIR => 'out', OUT_FIELDSEP => '=', ... VAL_MIN => 15, VAL_MAX => 3600, };
print <<USAGE; This program does this and that with the OUT_DIR. The filename is ... between VAL_MIN and VAL_MAX. USAGE
my $out_dir = OUT_DIR; my $out_fs = OUT_FIELDSEP; my $out_fn = OUT_FILENAME; ... between $valmin and $valmax. USAGE