Shell Builtins

[hoosierhobbyist]

Any interactive shell is going to have a few builtin commands that have to be implemented. This issue is to track what those commands are, and what their status is in quantum-shell. The aim here is to be as bash-like as possible, since that's what most people will be used to. As a reference I'm using https://www.gnu.org/software/bash/manual/html_node/Shell-Builtin-Commands.html#Shell-Builtin-Commands

Bourne Shell builtins

• [ ] :
• [ ] .
• [ ] break
• [x] cd
• [ ] continue
• [ ] eval
• [ ] exec
• [ ] exit
• [x] export
• [ ] getopts
• [ ] hash
• [x] pwd
• [ ] readonly
• [ ] return
• [ ] shift
• [ ] test
• [ ] times
• [ ] trap
• [ ] umask
• [ ] unset

  Bourne Again Shell (bash) builtins

• [x] alias
• [ ] bind
• [ ] builtin
• [ ] caller
• [ ] command
• [ ] declare
• [x] echo
• [ ] enable
• [ ] help
• [ ] let
• [ ] local
• [ ] logout
• [ ] mapfile
• [ ] printf
• [ ] read
• [ ] readarray
• [ ] source
• [ ] type
• [ ] typeset
• [ ] ulimit
• [x] unalias

  Others

• [x] clear
• [ ] dirs
• [ ] popd
• [ ] pushd
• [x] history
• [x] printenv
• [ ] shopt

I am currently working on implementations for cd, pwd, echo, history, alias, and unalias as I believe these to be the most commanly used and essential to any proper shell. Beyond that, however, I'm not really sure what most of these even do, or how they're meant to be used. Any and all help implementing these features is highly encouraged and appreciated! If you do decide to help out, please keep in mind that these features should behave exactly the same across all operating system (Windows, OS X, and Linux).