The program ‘gem’ can be found in the follwing packages

错误：The program ‘gem’ can be found in the follwing packages
在使用gem时出现下面错误：
gem install rails
解决方法：
 打开终端窗口的Edit>Profile Preferences>Title and command把”Run command as a login shell”选项选上，重启终端。
gem cannot be used
okey dokey~~
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