note BrowserUk <blockquote><i>is it some special kind of variable on the 10th line of our last example?</i></blockquote> <code> 10: $::PROGRAM = basename $0; </code> <p>You don't indicate which of the two variables in that line that you haven't encountered before. <ol><li><code>$::PROGRAM</code> <p>This is a package global variable in main. <code>$::var</code> is equivalent to <code>$main::var</code>. <p>See one of [broquaint]'s other tutorial's [id://211441] for more information if that was the source of your question. <p>The all upper case is a loose convention used to indicate global variables. </li><li><code> $0 </code> <p>This is documented in [http://perldoc.com/perl5.8.0/pod/perlvar.html|perlvar]. Search for the text "$PROGRAM_NAME". </li></ol> <p>HTH. <div class="pmsig"> <div class="pmsig-171588"> <hr /> <font size=1 > <div>Examine what is said, not who speaks.</div> "Efficiency is intelligent laziness." -David Dunham<br /> "Think for yourself!" - [Abigail-II|Abigail] <br /> [http://antwrp.gsfc.nasa.gov/apod/ap031001.html|Timing (and a little luck) are everything!]<br /> </p></font> </div></div> 268891 324896