chruby
Lightweight Ruby version switcher
TLDR
List available Ruby versions
$ chruby
Switch to specific Ruby$ chruby ruby-3.2.0
Switch to system Ruby$ chruby system
Show current Ruby$ chruby | grep '\*'
SYNOPSIS
chruby [rubyversion_ | system]
DESCRIPTION
chruby switches between multiple Ruby versions by modifying PATH and related environment variables. Lightweight alternative to RVM and rbenv. Just 90 lines of shell script.
Works with rubies installed by ruby-install or built from source.
SETUP
Add to ~/.bashrc or ~/.zshrc:
$ source /usr/local/share/chruby/chruby.sh
For auto-switching:$ source /usr/local/share/chruby/auto.sh
AUTO-SWITCHING
With auto.sh loaded, chruby reads .ruby-version files:
$ echo "ruby-3.2.0" > .ruby-version
Checks current and parent directories automatically.DEFAULT VERSION
Set in ~/.bashrc or ~/.zshrc:
$ chruby ruby-3.2.0
ENVIRONMENT
RUBIES
Array of Ruby installation pathsRUBY_ROOT
Current Ruby installation pathGEM_HOME / GEM_PATH
Gem directories
CAVEATS
Only switches versions - use ruby-install to install rubies. Does not override cd command (uses pre-prompt hook).
SEE ALSO
ruby-install(1), rbenv(1), rvm(1)