sh 执行gem时解决El Capitan错误（不允许errnoeperm操作） - 来自http://stackoverflow.com/questions/32891965/error-

Posted 2021-05-07

# Apparently with OSX el Capitan, there is a new security function that prevents 
# you from modifying system files called Rootless. 
# So you'll have 2 options:  If you install gems on "/usr/local/bin"
# there will be no problem because rootless doesn't affect this path.  

sudo gem install -n /usr/local/bin GEM_NAME_HERE