Linux Common Commands 2 chmod, chown

chmod Command

[Email protected] ~]# ls-l

Total 104

Drwxr-xr-x. 3 root root 4096 Jul 2 22:34 222

See here Drwxr-xr-x , R=4,w=2,x=1, so rwx=4+2+1=7,r-x=4+1=5, r-x=4+1=5, Therefore, the file permission can be represented as 755

[email protected] ~]# chmod 744 222// will be 222 Directory permission changed to 744,744 Permissions =rwxr--r--

[email protected] ~]# ls-ld 222// View permissions have changed  

Drwxr--r--. 3 root root 4096 Jul 2 22:34 222

[Email protected] ~]# chmod u=rwx,g=r--, o=r--222

// This method is used to chmod 744 222 achieve the same effect, u to be User Lord, g to be Group Group, o to be Other other

[Email protected] ~]# LS-LD 222

Drwxr--r--. 3 root root 4096 Jul 2 22:34 222

[email protected] ~]# chmod u-x 222//user minus x Permissions

[Email protected] ~]# LS-LD 222

Drw-r--r--. 3 root root 4096 Jul 2 22:34 222

[email protected] ~]# chmod u+x,g+w,o-r 222//u Plus x Permissions , G Plus W Permissions , O minus R Permissions

[Email protected] ~]# LS-LD 222

DRWXRW----. 3 root root 4096 Jul 2 22:34 222

[email protected] ~]# chmod a+r 222// all are added R permissions, All+r

[Email protected] ~]# LS-LD 222

Drwxrw-r--. 3 root root 4096 Jul 2 22:34 222

[Email protected] ~]# mkdir 222/234

[[Email protected] ~]# Tree 222

222

├── 111

│ └── 123.txt

└── 234

2 directories, 1 file

[Email protected] ~]# ls-l 222

Total 8

Drwxr-xr-x. 2 root root 4096 Jul 2 22:25 111

Drwxr-xr-x. 2 root root 4096 Jul 2 23:15 234

[Email protected] ~]# ls-l 222/111/

Total 48

-rw-r--r--. 1 root root 48308 Jul 2 22:25 123.txt

[email protected] ~]# chmod-r 222// make 222 file only Master has permission

[Email protected] ~]# ls-l 222

Total 8

drwx------. 2 root root 4096 Jul 2 22:25 111// The file all permissions are changed to the

DRWX------. 2 root root 4096 Jul 2 23:15 234

[email protected] ~]# umask// Default catalog file properties 0022

0022

[email protected] ~]# mkdir 1112// Create directory default permissions are 777-022

[Email protected] ~]# LS-LD 1112/

Drwxr-xr-x. 2 root root 4096 Jul 3 06:06 1112/

[[email protected] ~]# Touch 12.txt// the Create file default permission is 666-022 , (Files do not need X permissions)

[Email protected] ~]# ls-ld 12.txt

-rw-r--r--. 1 root root 0 Jul 3 06:07 12.txt

[email protected] ~]# umask 011// Change umask value

[Email protected] ~]# umask

0011

[Email protected] ~]# umask 022

Chown Command

[Email protected] ~]# ls-l

-rw-r--r--. 1 root root 48308 Jul 2 23:02 1.txt

[Email protected] ~]# chown Wangchao 1.txt

chown:invalid User: ' Wangchao '// no such user

[email protected] ~]# useradd Wangchao// Create user Wangchao

[email protected] ~]# Groupadd user1// Create a group User1

[email protected] ~]# chown:user1 1.txt// change file group to User1

[Email protected] ~]# ls-l 1.txt

-rw-r--r--. 1 root user1 48308 Jul 2 23:02 1.txt

[email protected] ~]# chown root:root 1.txt// Change master and group back Root , Root

[Email protected] ~]# ls-l 1.txt

-rw-r--r--. 1 root root 48308 Jul 2 23:02 1.txt

[email protected] ~]# chown-r wangchao:user1 1112/// Cascade Change subdirectory master, group

[email protected] ~]#!ls// perform the previous execution ls the command

Ls-l 1.txt

-rw-r--r--. 1 root root 48308 Jul 2 23:02 1.txt

[[Email protected] ~]# history// View the history commands used

654 ls-l 1.txt

655 history

[email protected] ~]#!654// in the Execution History command, section 654 Bar Command

Ls-l 1.txt

-rw-r--r--. 1 root root 48308 Jul 2 23:02 1.txt

This article is from the Linux Learning Notes blog, so be sure to keep this source http://9656134.blog.51cto.com/9646134/1676164

Linux Common Commands 2 chmod, chown