Error Sudo: Gem: Command Not Found

Error sudo: gem: command not found

Try without sudo. You should only use sudo if you did a root installation of ruby, which is not recommended.

Gem Command not found

Are you wanting ruby gems? If so, you need to install libgemplugin-ruby and then the ruby 'gem' program will be in your path:

aptitude install libgemplugin-ruby

Gem installed. Gem's command is not found

On some systems (e.g., Debian) the path where the gem executables are installed to are not in the $PATH. Dependingmon your distribution, that path is on a different location, on Debian with the system Ruby, it is at /var/lib/gems/1.8/bin. To add that to the system's $PATH, put something like this into a new file in /etc/profile.d/rubygems.sh

export PATH="$PATH:/var/lib/gems/1.8/bin"

Install gem gives Failed to build gem native extension.

You need to install make and other build tools first, run this:

sudo apt-get install build-essential

Ruby Gems returns command not found

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.

How to install a gem or update RubyGems if it fails with a permissions error

You don't have write permissions into the /Library/Ruby/Gems/1.8 directory.

means exactly that, you don't have permission to write there.

That is the version of Ruby installed by Apple, for their own use. While it's OK to make minor modifications to that if you know what you're doing, because you are not sure about the permissions problem, I'd say it's not a good idea to continue along that track.

Instead, I'll strongly suggest you look into using either rbenv or RVM to manage a separate Ruby, installed into a sandbox in your home directory, that you can modify/fold/spindle/change without worrying about messing up the system Ruby.

Between the two, I use rbenv, though I used RVM a lot in the past. rbenv takes a more "hands-off" approach to managing your Ruby installation. RVM has a lot of features and is very powerful, but, as a result is more intrusive. In either case, READ the installation documentation for them a couple times before starting to install whichever you pick.

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