Linux command: chmod

chmod Introduction to Commands:

This command is used to Modify permissions for a file or group.

1 . Command format:

chmod MODE files, ... Change the permissions for files to mode

To modify a class of users or some class user rights:

U,g,o,a

chmod User category =mode file,...

Modify some or some bit permissions for a class of users:

U,g,o,a

chmod User category +|-mode file,...

chmod +x means that users, groups, and other people's permissions are directly added to execute permissions

chmod a+x equals chmod +x

Chmod ug+x represents increased execution rights for users and groups

chmod u+x indicates that only the owner is given additional execution privileges

2 . Command function:

Modify permissions for a file or directory category three users

3 . Command parameters:

-R recursively Change permissions for directories and their sub-files

--reference=/path/files files The permissions for the three categories of users

Change to the same file as the path specified.

4 . Command instance:

#chmod ' U=RW,G=RW ' 100.sh set 100.sh user and group permissions to RW permissions

#chmod ug=rw 100.sh equals chmod u=rw,g=r

[[email protected] test]# chmod ug-x 100.sh Canceling the execution rights of users and groups

[Email protected] test]# ls-l

-rw-rw-r-x. 1 donggen Root 273 September 19:49 100.sh

User and group execution permissions have been removed

[[email protected] test]# chmod u+x,g+w 100.sh Increase user execution rights and group write permissions

[Email protected] test]# ls-l

-rwxrw-r-x. 1 donggen Root 273 September 19:49 100.sh

The appropriate permissions for users and groups have been increased.

This article is from the "Learn Linux history" blog, please be sure to keep this source http://woyaoxuelinux.blog.51cto.com/5663865/1861878

Linux command: chmod