By ll file name to view file permissions, as shown below.
Permissions total of 10, the first indicating the file type, d represents a directory, - on behalf of ordinary files. r (read for read permission), w (write on behalf of write permission), x (execute on behalf of the Executive authority)
After nine categories represent read and write permissions file.
Letter notation:
After nine in the top three, who represents the file creation permissions, user shorthand for u
In three, the file permissions on behalf of the creator's group, group shorthand g
Other users where the group after three, representing the creator of the file operation authority, others short o
all = user + group + others
all on behalf of the authority, a shorthand
Numeric representation:
Three each represents a binary number, corresponding rights wxr 7 (i.e., 111, is the highest authority)
Modify the file permissions command: chmod
1. be modified by letter shorthand, be modified by addition and subtraction x (execute the file permissions) on the creator permission.
2. be modified by digital
