Gash is a POSIX-compatible shell written in Guile Scheme. It provides both the shell interface, as well as a Guile library for parsing shell scripts. Gash is designed to bootstrap Bash as part of the Guix bootstrap process. There are plans to develop Gash into a general-purpose shell and tool for building interfaces between Scheme and the shell. Features of the shell * Sophisticated enough to be used to build Bash. * Has a nice colorized prompt. * Includes all of the POSIX-specified "special" built-ins except for `times'. * Includes about half of the POSIX-specified "regular" built-ins (see `gash/built-ins.scm' for details). Features of the programming interface * Parses Shell scripts into an AST. * Provides a rudimentary interface for writing Shell-like Scheme scripts.