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Howto fix RVM path issues

I had some trouble with rvm lately on the Odroid setup which took me some time to figure it out. I had no idea what might be wrong because I have been using rvm on all my setups for the last 5 years without any issues. And as I have all my dotfiles stored in a GitHub repository I was quite sure, that I had a working zshrc.

But when I logged in I noticed that I was always falling back to system’s ruby even though I had set the rvm ruby version as default. And when I tried to re-set the ruby as default again I got the following warning from rvm:

Warning! PATH is not properly set up, ‘$HOME/.rvm/gems/ruby-2.1.5/bin’ is not at first place, usually this is caused by shell initialization files - check them for ‘PATH=…’ entries, it might also help to re-add RVM to your dotfiles: ‘rvm get stable –auto-dotfiles’, to fix temporarily in this shell session run: ‘rvm use ruby-2.1.5’.

It took quite some while and lots of useless googling to find the reason: I made the mistake to install rvm for the root user, too. I never did that before (and I probably never will ever again) and did not know that rvm installs /etc/profile.d/ if it has root rights.
Because this zlogin was evaluated first and I later moved parts of the PATH in my local ~/.zshrc becore finally calling the rvm scripts again, rvm got messed up and did not work correctly. After deleting /etc/profile.d/ this was fixed.

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