file permissions

r: 4

w: 2

x: 1

Read, write and execute (full) permission on a file in octal is 0+r+w+x = 0+4+2+1 = 7

Only Read and write permission on a file in octal is 0+r+w+x = 0+4+2+0 = 6

Only read and execute permission on a file in octal is 0+r+w+x = 0+4+0+1 = 5

Use above method to calculate permission for group and others. Let us say you wish to give full permission to owner, read & execute permission to group, and read only permission to others, then you need to calculate permission as follows: User = r+w+x = 0+4+2+1 = 7 Group= r+w+x = 0+4+2+0 = 6 Others = r+w+x = 0+0+0+1 = 1

Effective permission is 761.

1        execute-only           --x

2           write               -w-

3     execute  and  write       -wx

4          read-only            r--

5    read  and  execute         r-x

6       read  and  write        rw-

7  read,  write,  and  execute  rwx

7 – for read, write, and execute permission

6 – for read and write privileges

5 – for read and execute privileges

4 – for read privileges