Zhangminghui-linux Basic Command Learning-5

"Let the summary become a habit"

PWD Prints the current working directory print working directory

Pwd-l

The default parameter for PWD is-l, which is the same as performing the PWD and executing pwd-l results, in fact using the environment variable pwd

Echo $PWD

Pwd

Pwd-l

Pwd-p

print the physical directory without any symbolic links

when we switch to the/ETC/INIT.D directory

actually, it's the same as switching to the/ETC/RC.D/INIT.D directory.

Execute the same effect

mkdir Creating directories Make Directory

Mkdir-p/bj/x/w/j to create a directory J, you must first create a/bj/x/w, or you already have/bj/x/w, and if you do not create the parent directory (if there is an error, make the parent directory as needed)

Mkdir/bj/x/w/j creation failed because the parent directory was not created first

Mkdir-p/bj/x/w/j created successfully, if there is no parent directory, the parent directory will be created as needed

mkdir-v

Display the creation process for a directory

MKDIR-PV parameter-PV often used in conjunction with

Create catalogs in batches (Create/xwj/dir1, Dir2, Dir3, dir ... dir10 and show the creation process)

relative path: Path not starting from/root

Absolute path: The path starting from/root

CD Switch Directory change directory

CD Default switch home directory

CD ~ Switch Home directory

CD-Switch to the last catalog CD-the system variable OLDPWD is called

Cd.. Switch to Parent directory

Tree lists the directory of files

Tree-a can also view the directory structure of hidden files

TREE-D directory structure only

Tree-l 2 only shows the structure of level 2 directories and files

TREE-DL 2 only shows the structure of level 2 directory

TREE-F displays the full path for each file or directory

TREE-DLF three parameters combined with the effect added

Tree-i does not display horizontal lines

Tree-dlfi parameters combined with the effect added

Tree-f ability to differentiate files and directories

Touch

1. No files, create files

2. Change the timestamp of the file (learn)

[Email protected] ~]# stat xwj.txt

Show the status of a file

Access time for access

Modify Modification Time

Change Time

[[email protected] ~]# touch-a xwj.txt access time and change time will change

[email protected] ~]# touch-m xwj.txt modification time and change time will change

Summary: Change changes with access

Change changes with Modify

Zhangminghui-linux Basic Command Learning-5