Testing Condition on File permission

Question

Hi, i am learning shell scriptnig, is there any way i can test the operation like checking file permission on a file.. like... i know some of the way like. searching the file through find command using permission, or in "ls...| grep 'r--r--r' smthg.. whatever permission u wan't

I have some file how i check whether the file have the required permission or not..?\

Thanks in advance..

Answer 1

http://tldp.org/LDP/abs/html/fto.html

Answer 2

You could use test

The options -r -x -w test for read,execute and write permission. In a shell script the test command is usually entered as [

Answer 3

stat FILENAME --print=%A

see man stat for more options - you can check the group/owner/etc.

Answer 4

Check the man page of find. under EXAMPLES. you can see how to find files with desired permission.

Answer 5

You can do something like:

Test for execution:

if [ -x "$file" ]; then #do_something fi

Test for writting:

if [ -w "$file" ]; then #do_something fi

Test for reading:

if [ -r "$file" ]; then #do_something fi