shell命令cd回退

Shell命令cd用于切换当前工作目录。如果要回退到上一级目录，可以使用`cd ..`命令。这将使当前目录变为上一级目录。换句话说，它将取消当前目录的最后一个目录路径部分。例如，如果当前目录为`/home/user/documents`，使用`cd ..`命令后，当前目录将变为`/home/user`。这样就实现了回退操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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