From perldoc perlvar: 
      $0      Contains the name of the program being executed.

               On some (read: not all) operating systems
               assigning to $0 modifies the argument area that
               the "ps" program sees.  On some platforms you may
               have to use special "ps" options or a different
               "ps" to see the changes.  Modifying the $0 is more
               useful as a way of indicating the current program
               state than it is for hiding the program you're
               running.  (Mnemonic: same as sh and ksh.)

               Note that there are platform specific limitations
               on the the maximum length of $0.  In the most
               extreme case it may be limited to the space
               occupied by the original $0.

               In some platforms there may be arbitrary amount of
               padding, for example space characters, after the
               modified name as shown by "ps".  In some platforms
               this padding may extend all the way to the
               original length of the argument area, no matter
               what you do (this is the case for example with
               Linux 2.2).

               Note for BSD users: setting $0 does not completely
               remove "perl" from the ps(1) output.  For example,
               setting $0 to "foobar" may result in "perl: foobar
               (perl)" (whether both the "perl: " prefix and the
               " (perl)" suffix are shown depends on your exact
               BSD variant and version).  This is an operating
               system feature, Perl cannot help it.

               In multithreaded scripts Perl coordinates the
               threads so that any thread may modify its copy of
               the $0 and the change becomes visible to ps(1)
               (assuming the operating system plays along).  Note
               that the the view of $0 the other threads have
               will not change since they have their own copies
               of it.

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--tidiness is the memory loss of environmental mnemonics

In reply to Re: Get My Own Name by EvdB
in thread Get My Own Name by peschkaj

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