One Linux command per day (2): cd command

Linux CD commands can be said to be the most basic Linux command statements, the other command statements to operate, are based on the use of the CD command.

Therefore, to learn the common Linux commands, the first step is to learn How to use the CD command skills.

1. Command format:

cd [ directory name ]

2. Command function:

Toggle current directory to DirnamE

3. Common examples

3.1 Example One: Enter the system root directory

Command:

CD/

Output:

[[Email protected] ~]# CD/

Note: Enter the system root directory, the above command after the execution of the LS command to see, the current directory has been to the system root directory

Command:

Cd.. or CD. //

Output :

1 [[Email protected] soft]# pwd
2/opt/soft
3 [[Email protected] soft]# CD.
4 [[Email protected] opt]# CD. //
5 [[email protected]/]# pwd
6/

Description

Enter the system root directory to use the CD. " always back, you can reach the root directory

Command:

Cd.. /.. //

Output:

1 [[Email protected] soft]# pwd
2/opt/soft
3 [[Email protected] soft]# CD. /.. //
4 [[email protected]/]# pwd
5/
6 [[Email protected]/]#

Description: Use the CD command to implement the parent directory into the parent directory of the current directory.

Example 2: Using the CD command to enter the current user home directory

The "Current User home Directory" and "system root" are two different concepts. There are two methods to enter the current user home directory.

Command 1:

Cd

Output:

1 [[Email protected] soft]# pwd
2/opt/soft
3 [[Email protected] soft]# CD
4 [[email protected] ~]# pwd
5/root

Command 2:

CD ~

Output:

1 [[Email protected] ~]# cd/opt/soft/
2 [[email protected] soft]# pwd
3/opt/soft
4 [[Email protected] soft]# CD ~
5 [[email protected] ~]# pwd
6/root

Example 3: Jump to a specified directory

Command:

Cd/opt/soft

Output:

1 [[Email protected] ~]# Cd/opt/soft
2 [[email protected] soft]# pwd
3/opt/soft
4 [[Email protected] soft]# CD jdk1.6.0_16/
5 [[email protected] jdk1.6.0_16]# pwd
6/opt/soft/jdk1.6.0_16
7 [[Email protected] jdk1.6.0_16]#

Description

Jump to the specified directory, starting from the root directory, the directory name plus /, The current directory in the subdirectory directly write the name can be

Example four: Return to the directory in which it was before entering this directory

Command:

CD-

Output:

1 [[Email protected] soft]# pwd
2/opt/soft
3 [[Email protected] soft]# CD-
4/root
5 [[email protected] ~]# pwd
6/root
7 [[Email protected] ~]# CD-
8/opt/soft
9 [[Email protected] soft]#

Example five: Use the parameters of the previous command as CD parameters. The previous CD command is executed

Command:

CD!$

Output:

1 [[Email protected] soft]# CD!$
2 CD-
3/root
4 [[Email protected] ~]# CD!$
5 CD-
6/opt/soft
7 [[Email protected] soft]#

One Linux command per day (2): cd command