Setting up a new Ubuntu 12.04 LTS server I kept getting the error below when trying to run the rvm command.
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$ rvm RVM can not be run with `set -o posix` |
This was solved by changing the login shell for my user. It prompts for your password and shell which I changed from /bin/sh to /bin/bash.
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$ chsh Password: ****** Changing the login shell for some_user Enter the new value, or press ENTER for the default Login Shell [/bin/sh]: /bin/bash |