如何创建使用变量执行大量命令的命令行（unix / linux）指令？

I need to rearrange some content in various directories but it's a bit of a pain. In order to debug the application I'm working on (a ruby app) I need to move my gems into my gem folder one at a time (long story; nutshell: one is broken and I can't figure out which one).I need to rearrange some content in various dir