The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a command interpreter for shell scripting. Zsh is an extended Bourne shell with many improvements, including some features of Bash, ksh, and tcsh. This variant comes with statically linked zsh modules like zsh/regex to ease the consumption of existing scripts relying on such modules. It has a slightly larger memory footprint compared to the package without modules which may not be desirable for lower-end devices with less RAM.