linux cd1.指令格式：2.指令功能3. 常用範例

cd -傳回之前的目錄

cd !$ 把上個指令的參數作為這個指令的參數

轉載：

https://www.cnblogs.com/huchong/p/9829238.html 閱讀目錄(Content)

• 1.指令格式：
• 2.指令功能
• 3. 常用範例
• 1.進入系統根目錄
• 2. 傳回父級目錄
• 3.進入目前目錄的父目錄的父目錄
• 4. 進入目前使用者主目錄
• 5. 跳轉到指定目錄
• 6.傳回進入此目錄之前所在的目錄
• 7. 把上個指令的參數作為cd參數使用

回到頂部(go to top)

cd   [目錄名]
           

切換目前目錄至 [目錄名]

指令：

cd  / 
           

說明：進入系統根目錄,上面指令執行完後拿ls指令看一下，目前目錄已經到系統根目錄了

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

           

pwd的作用是查詢目前所在目錄

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
           

“目前使用者主目錄”和“系統根目錄”是兩個不同的概念。進入目前使用者主目錄有兩個方法。

指令1：

cd
           

直接輸入cd，然後回車

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
           

上面的指令是我在非root使用者下操作的，現在我切換到root使用者下再操作一遍

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
           

指令2：

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
           

指令

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 -
           

說明：自動跳轉到進入此目錄之前所在的目錄，并輸出所在目錄名稱

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 !$
           

輸出:

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