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docs/stack.md
@@ -89,7 +89,7 @@ $ popd +3
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$ popd -3
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```
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-上面例子的整数编号都是从0开始计算,`popd +0`是删除第一个目录,`popd +1`是删除第二个,`popd -0`是删除最后一个目录,,`popd -1`是删除倒数第二个。
+上面例子的整数编号都是从0开始计算,`popd +0`是删除第一个目录,`popd +1`是删除第二个,`popd -0`是删除最后一个目录,`popd -1`是删除倒数第二个。
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**(3)目录参数**
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