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linux cd root directory

https://www.cyberciti.biz/faq/how-to-change-directory-in-linux-terminal/

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/4/html/Step_by_Step_Guide/s1-changing-dirs.html

hosts

$ cd /
# OR
$ cd /.

$ cat /etc/hosts

$ vim /etc/hosts

linux cd command

# 切换到当前用户的根目录(绝对路径)
$ cd
# 等价于
$ cd ~

# 切换到上层目录(相对路径)
$ cd -
# 等价于
$ cd ..

# 切换到系统的根目录(绝对路径)
$ cd /

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