Linux Commands: Modify file Permissions command chmod, CHGRP, chown differences

Chmod is the right to change a file   Chown is the owner and genus of the modified file  Chgrp only the genus group that changed the file.

(1) chmod is the right to modify the file/directory. can have text modification and digital modification.

#chmod 777/home/berry

#chmod U+x/home/berry

Action object who is either or a combination of the following letters:

• U means "user", which is the owner of the file or directory.
• G means "same group user", that is, all users who have the same group ID as the file owner.
• O means "other (others) users".
• A means "all users". It is the system default value.

#chmod ug+w,o-x text

(2) CHGRP is a group that modifies a file or directory to which it belongs. ( just change the group of files )

#chgrp-R Guest/var/tmp/f.txt

# chgrp - R root/home/berry/file/a.txt

(3) chown modify File/directory owner and group. ( the owner and the genus of the document are changed )

#chown Guest:guest A.txt

#chown-R Guest/home/berry (change all files under the Berry file to the guest group)

Linux Commands: Modify file Permissions command chmod, CHGRP, chown differences