Joke de Buhr wrote:
[...]
>   #!/bin/sh
>=20=20=20
>   if [ -z "$ZSH_VERSION" ]; then
>       ## searching PATH for zsh executable
>       exec zsh $0 $*

That should rather be
        exec zsh "$0" "$@"

Or even better, as Vicent put it:
       exec zsh -- "$0" ${1+"$@"}

The `--' should be pretty clear. About the ${1+"$@"}, see:
  <http://www.in-ulm.de/~mascheck/various/bourne_args/>

Regards, Frank

=2D-=20
In protocol design, perfection has been reached not when there is
nothing left to add, but when there is nothing left to take away.
                                                  -- RFC 1925