No such thing. You produced it yourself, just now.

# create such a thing
BEGIN { ${^CMDLINE} = "$0 @ARGV" }
[download]

But that's not entirely accurate. You should add quotes around each element in @ARGV, and quotemeta() them.

BEGIN {
  ${^CMDLINE} = join ' ',
      $0,
      map "'\Q$_\E'",
      @ARGV
}
[download]

This variable will then be as global as @ARGV and $0.

_____________________________________________________
Jeff[japhy]Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;