问题
It seems that ruby 2.0.0 has added "default" gems to the mix and makes them non removable by gem uninstall.
How can you remove all non default gems?
回答1:
I used this one line script.
for i in `gem list --no-versions`; do gem uninstall -aIx $i; done
It ignores default gem errors and just proceeds. Simple and self-evident.
回答2:
First, go to the gems directory
Like ../ruby/2.0.0-p195/lib/ruby/gems/2.0.0/specifications
You will find a directory named default, which including all the default gems shipped with ruby 2.0
Move all the *.gemspec stored in default dir to specifications dir and remove the empty default dir.
Then you can do whatever you want like old days.:-)
回答3:
I wrote a script in ruby to remove all non default gems.
https://gist.github.com/nixpulvis/5042764
This is needed now because unlike before 2.0.0 some gems are labeled "default" with the installation of ruby, and cannot be uninstalled with gem uninstall. This makes the previously popular methods for deleting all gems not work.
For reference here it is.gem list | cut -d" " -f1 | xargs gem uninstall
回答4:
I have not yet found a better answer than to exclude the "default" gems:
/usr/local/bin/gem list --no-versions | \
grep -v -E "(bigdecimal|io-console|json|minitest|psych|rake|rdoc|test-unit)" | \
xargs --no-run-if-empty /usr/local/bin/gem uninstall --executables --user-install --all --force
来源：https://stackoverflow.com/questions/15100496/uninstalling-all-gems-ruby-2-0-0