linux目录切换pushd和popd

linux中关于目录切换有两个特别好用的命令pushd, popd.　比cd便捷，而且特别适合在不同目录下工作的情况．
pushd : push (in) directory,将目录压栈,最后一个压入的目录位于栈顶;
popd : pop (out) directory,将目录栈逐个弹出．

例如：

:~/lana/share/study/py$ pushd ~/workspace_apk/~/workspace_apk ~/lana/share/study/py:~/workspace_apk$ pushd ~/lana/share/toshare/~/lana/share/toshare ~/workspace_apk ~/lana/share/study/py:~/lana/share/toshare$ dirs -v 0  ~/lana/share/toshare 1  ~/workspace_apk 2  ~/lana/share/study/py:~/lana/share/toshare$ pushd~/workspace_apk ~/lana/share/toshare ~/lana/share/study/py:~/workspace_apk$ pushd~/lana/share/toshare ~/workspace_apk ~/lana/share/study/py:~/lana/share/toshare$ pushd~/workspace_apk ~/lana/share/toshare ~/lana/share/study/py:~/workspace_apk$ pushd +2~/lana/share/study/py ~/workspace_apk ~/lana/share/toshare:~/lana/share/study/py$ dirs -v 0  ~/lana/share/study/py 1  ~/workspace_apk 2  ~/lana/share/toshare:~/lana/share/study/py$ popd~/workspace_apk ~/lana/share/toshare:~/workspace_apk$ popd~/lana/share/toshare:~/lana/share/toshare$ popdbash: popd: 目录栈为空:~/lana/share/toshare$ 

请注意，pushd不带参数，就会在栈顶的两个目录之间切换．如果需要调整到其他目录，可以使用+n参数．具体每个栈内目录编号，通过dirs -v查看。

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