cd [目錄名]命令：
cd /輸出：
hc@hc-virtual-machine:~$ pwd
/home/hc
hc@hc-virtual-machine:~$ cd /
hc@hc-virtual-machine:/$ ls
bin dev initrd.img lib64 mnt root snap sys var
boot etc initrd.img.old lost+found opt run srv tmp vmlinuz
cdrom home lib media proc sbin swapfile usr
命令：
cd ..hc@hc-virtual-machine:~/pycharmprojects$ pwd
/home/hc/pycharmprojects
hc@hc-virtual-machine:~/pycharmprojects$ cd ..
hc@hc-virtual-machine:~$ pwd
/home/hc
cd ../..hc@hc-virtual-machine:~/pycharmprojects$ pwd
/home/hc/pycharmprojects
hc@hc-virtual-machine:~/pycharmprojects$ cd ../..
hc@hc-virtual-machine:/home$ pwd
/home
「當前使用者主目錄」和「系統根目錄」是兩個不同的概念。進入當前使用者主目錄有兩個方法。命令1：
cd輸出：
hc@hc-virtual-machine:~/pycharmprojects/my_test$ pwd
/home/hc/pycharmprojects/my_test
hc@hc-virtual-machine:~/pycharmprojects/my_test$ cd
hc@hc-virtual-machine:~$ pwd
/home/hc
hc@hc-virtual-machine:~/pycharmprojects/my_test$ sudo su
root@hc-virtual-machine:/home/hc/pycharmprojects/my_test# pwd
/home/hc/pycharmprojects/my_test
root@hc-virtual-machine:/home/hc/pycharmprojects/my_test# cd
root@hc-virtual-machine:~# pwd
/root
cd ~hc@hc-virtual-machine:~/pycharmprojects/my_test$ pwd
/home/hc/pycharmprojects/my_test
hc@hc-virtual-machine:~/pycharmprojects/my_test$ cd ~
hc@hc-virtual-machine:~$ pwd
/home/hc
cd /home/hc/pycharmprojects/my_test/hc@hc-virtual-machine:/$ pwd
/hc@hc-virtual-machine:/$ cd /home/hc/pycharmprojects/my_test/
hc@hc-virtual-machine:~/pycharmprojects/my_test$ pwd
/home/hc/pycharmprojects/my_test
cd -輸出：
hc@hc-virtual-machine:/$ pwd
/hc@hc-virtual-machine:/$ cd /home/hc/pycharmprojects/my_test/
hc@hc-virtual-machine:~/pycharmprojects/my_test$ pwd
/home/hc/pycharmprojects/my_test
hc@hc-virtual-machine:~/pycharmprojects/my_test$ cd -
/hc@hc-virtual-machine:/$ pwd
/
cd !$hc@hc-virtual-machine:~/pycharmprojects/my_test$ pwd
/home/hc/pycharmprojects/my_test
hc@hc-virtual-machine:~/pycharmprojects/my_test$ ls /opt/
google
hc@hc-virtual-machine:~/pycharmprojects/my_test$ cd !$
cd /opt/
hc@hc-virtual-machine:/opt$ pwd
/opt
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