[RUBY] How to deal with the error ERROR: While executing gem ... (Gem :: FilePermissionError)

This is a workaround for Gem errors that occurred when Re: View was installed.

$ gem install review

ERROR: While executing gem ... (Gem::FilePermissionError) You don't have write permissions for the /Library/Ruby/Gems/2.6.0 directory.

An error like this is output.

The permission to install gem is not allowed

$ sudo gem install review

I think that you can install it by sudo as above, but this time I want to install it in the user area, so I will explicitly specify ** installation destination (GEM_HOME) ** to avoid the error.

$ mkdir -p $HOME/rubygems
$ export GEM_HOME=$HOME/rubygems
$ export PATH=$GEM_HOME/bin:$PATH

Write these 3 lines in ~ / .zshrc etc. and complete.

There is no trouble due to authority.

reference

[ruby] Install gem in user area-Life.

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