CHMOD Linux Command (numeric mode)

After we read about chmod octal mode, this time we will change right akases or chmod files / folders using a numeric mode. Actual numeric mode is almost similar to the calculation of the octal mode. Numeric mode refers to the following table:

 through the table we can determine what number should we fill in to change the access rights according to our wishes.
for example: note the blue line below.

The distribution of access rights.

 drwxr-xr-x 2 root root   4096 Nov  5 20:48 cdebconf




 The blue colored lines declare the permissions of a directory.
Now we will change the access rights on a calculation using numeric mode table above. As in the calculation of octal mode, the access rights will now be divided into three groups, each group having 3 digit number that represents the permissions.

d          rwx          r-x          r-x     2 root root   4096 Nov  5 20:48 cdebconf
          group-1       group-2       group-3
                user           group           other

 Now we will change the directory access rights are entitled to full access to all its group. Note the calculations in the table above.

typing in a terminal: 
chmod 777 filename

chmod 777 cdebconf or
chmod 0777 cdebconf

then type :

ls -l
  
drwxrwxrwx 2 root root   4096 Nov  5 20:48 cdebconf
 


prior to the change permissions:
 drwxr-xr-x 2 root root   4096 Nov  5 20:48 cdebconf

after changes permissions :
drwxrwxrwx 2 root root   4096 Nov  5 20:48 cdebconf