13. File Rights Management

1. Three kinds of basic permissions? R Read permission? W Write permission? X Execute permissions 2. View file and directory permissions? ls–l file name? Display information includes: file type (d directory,-normal file, L link file), file permissions, directory subdirectory or file hard link number, file owner, file group, file size, file creation time, file name? rw-r--r--1 itcast users 2254 2006-05-20 13:47 tt.htm? From the second word character rw-is said that the user itcast have read, write right, no operation right, then the r--indicates that user group users only Read permission, no operation right, The last r--refers to other people (others) only read permission, no write right and run right. 3. Change the operation permissions? chmod "U Master g belongs to group user o Other User a All users" "+ Plus permissions – minus permissions = Plus permissions Remove legacy permissions at the same time delete" "rwx" file or directory name

such as chmod g+w file

?-r The following subdirectories do the same permissions operation? You can also use numbers to represent permissions such as chmod 777 File?r 4 W 2 x 1? to rwx properties 4+2+1=7;? to rw-the property 4+2=6;

4. Change of the principal and the genus Group

Chown command

Purpose: Changes the owner or group associated with the file.

Grammar
Chown [-R] Owner [: Group] {File ... | Directory ...}

For example:

Chown Jim Program.c
Chown-r JOHN:BUILD/TMP/SRC

5. Change the group

CHGRP command: Command to change the group to which the file or directory belongs

For example:

Chgrp Jim Test.txt

Chgrp–r jim/test/

13. File Rights Management