Jail is a chrooted environment using bash. its main use is to put it as shell for any user you want to be chrooted. Their primary goals is to be simple, clean, and highly portable.
Changes: Cosmetic cleanup of the Makefile script, now you can install & build it from a single command (as root)! Added some useful comments into the code. IRIX 6.5 bug in execve() confirmed and isolated.