如何将文件恢复到git中的先前状态？

Question

鉴于以下互动:

$ git add foo 
$ git commit -m "Initial import of 'foo'"
$ rm foo # This could be any destructive action on foo, like editing it.

如何在工作副本中恢复"foo"？我正在寻找类似的东西:

$ git <magic> foo
Restored foo to revision <blah>.