Hack 4. Toggle Between Directories

cd - 命令是在linux中在最近的两个目录之间实现快速切换的commond line：

jack@Ubuntu:~$ pwd
/home/jack
jack@Ubuntu:~$ cd /tmp/very/long/directory/structure/that/is/too/deep/
jack@Ubuntu:/tmp/very/long/directory/structure/that/is/too/deep$ cd /tmp/subdir1/subdir2/subdir3/
jack@Ubuntu:/tmp/subdir1/subdir2/subdir3$ cd -
/tmp/very/long/directory/structure/that/is/too/deep
jack@Ubuntu:/tmp/very/long/directory/structure/that/is/too/deep$ pwd
/tmp/very/long/directory/structure/that/is/too/deep
jack@Ubuntu:/tmp/very/long/directory/structure/that/is/too/deep$ cd -
/tmp/subdir1/subdir2/subdir3
jack@Ubuntu:/tmp/subdir1/subdir2/subdir3$ pwd
/tmp/subdir1/subdir2/subdir3

在做一些经常要在两个目录之间切换的操作会提供一点方便。
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