Arsh is the Advanced Ruby Shell, and intends to be a pure ruby implementation of the Linux shell. Currently, the shell is capable of running ordinary Linux commands as well as arbitrary Ruby code. Tab complete functionality works as well.
gem install arsh
If you use RVM, you will need to run the following script to reconfigure it for RVM, otherwise the shell will only work when spawned by a Bash shell.
Most flavors of linux will require you to edit /etc/shells to add the new shell before it can be used.
Once that is done, modify your user shell to the new shell, logout, and log back in
Most of the Shell can be configured via 2 files. /etc/arshrc for global configuration, and $HOME/.arshrc. Environment variables can be configured there, as well as global variables and other configuration. An example arshrc configuration file would look as follows
$ps1="(arsh) " + "<% ENV['USER'] %>@<% `hostname`.chomp %>".console_green.console_bold + "<% Dir.pwd %> $ ".console_blue.console_bold alias ls=ls --color ENV['PATH'] = "/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/x86_64-pc-linux-gnu/gcc-bin/4.5.3" ENV['HIST_COUNT'] = "1000" rvm use 1.9.3
The arshrc files are pure ruby, but multiple line evaluation is not currently possible.
Color prompts are done via a monkey patch to the String class so as to not break line breaking.