in reply to what does this piece of code mean?

Did you try searching for it?  [-x -S $0 ${1+"$@"}] [ddg://site:perlmonks.org "-x -S $0 ${1+"$@"}"] -x -S $0 ${1+"$@"} site:perlmonks.org "-x -S $0 ${1+"$@"}" -> Perl wrapper, execute perl script frm shell script

In Section Seekers of Perl Wisdom