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Linux常用命令-10：cd
source link: https://xugaoxiang.com/2022/06/02/linux-cmds-10-cd/
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cd 是 change directory 的缩写，意思就是进入到另一个目录，它是命令行中最常用的操作。这里的目录可以是绝对路径(如 /usr/lib)，也可以是相对路径(如 ../../)
语法格式：cd [参数] [目录名]
常用参数：
# 切换到目录/var/www
cd /var/www
# 切换到父目录
cd ../
# 回到我的主目录
cd ~
# 回到切换前的目录，比如从目录A切换到目录B，执行命令后，就是回到目录A，对于目录特别深的场景，非常方便
cd -Recommend
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