Zsh gets new stable release after four years
The developers of the Z shell have announced the release of zsh 5.0.0, the first major stable version of the tool since zsh 4.2 was released in 2004. Zsh is a shell for Unix and Unix-like operating systems that is mainly designed for interactive use, but is also suited to other tasks. The latest stable release of the project was zsh 4.2.7 in 2008.
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump