Ruby Gems returns “command not found”

Question

Ubuntu 9.10

Just installed newgem

gem install newgem

and when i try

newgem new_project

I get

Answer 1

Your $PATH variable needs to include the exact path to your Ruby's bin directory. Adding a directory to the PATH does not include it's subfolders. Try adding the bin directory via:

export PATH=$PATH:/home/adam/.gem/ruby/1.8/bin

or if you installed the gem using sudo:

export PATH=$PATH:/usr/lib/ruby/gems/1.8/bin

You might want to add this to your .bashrc file, so that you don't have to set this manually every time your open up a new bash.

Answer 2

(Just stealing @John Franklin's comment)

$ gem environment

Will tell you the EXECUTABLE DIRECTORY. Then put whatever that value is in your PATH like so (in your .bashrc or other shell config file).

export PATH="$PATH:/path/to/bin"

Reload your shell and you should then be able to use the installed gem.

Answer 3

If you use RVM (most do), then it will take care of this for you. In fact putting it in your path directly may conflict. You have to set a ruby to use though. Run one of these on the command line.

rvm use 1.9.3

or

rvm use --default 1.9.3