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pushd
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===
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将目录加入命令堆叠中
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## 补充说明
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**pushd命令** 是将目录加入命令堆叠中。如果指令没有指定目录名称，则会将当前的工作目录置入目录堆叠的最顶端。置入目录如果没有指定堆叠的位置，也会置入目录堆叠的最顶端，同时工作目录会自动切换到目录堆叠最顶端的目录去。
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### 语法
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```
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pushd(选项)(参数)
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```
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### 选项
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```
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-n：只加入目录到堆叠中，不进行cd操作；
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+n：删除从左到右的第n个目录，数字从0开始；
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-n：删除从右到左的第n个目录，数字从0开始；
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```
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### 参数
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目录：需要压入堆栈的目录。
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### 实例
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```
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root@Mylinux:/tmp/dir4# pushd /tmp/dir3
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/tmp/dir3 /tmp/dir4 /tmp/dir1 ~
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root@Mylinux:/tmp/dir3# pushd /tmp/dir2
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/tmp/dir2 /tmp/dir3 /tmp/dir4 /tmp/dir1 ~
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root@Mylinux:/tmp/dir2# pushd -1
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/tmp/dir1 ~ /tmp/dir2 /tmp/dir3 /tmp/dir4
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```
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注意：最左边表示栈顶，最右边表示栈底。
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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