Chmod;chgrp;chown

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# Rights Management directive chmod CHGRP Chown #

# Modified time: 20160529 #

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chmod

The basic rights of Linux files are divided into user/group/others three identities each have Read/write/exectue permissions

-Rwx rwx rwx: First expression file type [d for directory;-for file; l for link file],

The first group is the file owner, the second group is group permissions, and the third group is for other users

R is read permission, W is write permission, X is execute permission, and the digital 421来 is usually used to assign to Rwx,r=4;w=2;x=1.

That is, 5 represents r+x (4+1) and 7 represents r+w+x (4+2+1).

chmod u=rwx,g=rwx,o=rwx filename

Permissions can be set directly via U (user), G (group), O (Others), a (all),

You can also increase or decrease the corresponding permissions by U+r/g-w.

chmod [-r] XYZ filename

[-R] iterates over all subdirectories or files in the directory,

XYZ represents permissions, such as setting 777 to give RWXRWXRWX permissions, and 640 giving rw-r-----permissions.

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Chgrp/chown:

　　The file has the corresponding user, group,

CHGRP [-r] GroupName filename

Chown [-r] Username filename

　　[-R] downward recursive loop modification

Modify Groupname,chown Modify username by chgrp

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Chmod;chgrp;chown