It's a conditional ternary operator. You can read about it in perlop. An equivalent to Zaxo's

print exists $search{$_}   ?
          "$_ : Found $_\n"    :
          "$_ : Not Found $_\n";

[download]
would be this:
if (exists $search{$_})
{
    print "$_ : Found $_\n";
}
else
{
    print "$_ : Not Found $_\n";
}

[download]
The result is the same, but the layout is more compact with less duplication.

Do not rebuke them with harsh words ... but rather lead them gently - with URLs - so that they may learn wisdom.

In reply to Re^3: searching 2 arrays by VSarkiss
in thread searching 2 arrays by Anonymous Monk

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