chown user2:accounting script.sh
➤ Sets the file owner to user2 (who maintains the script) and the group to accounting (which includes user1).
chmod 750 script.sh
➤ Sets permissions to:
7 (owner = user2) → read, write, execute

5 (group = accounting) → read, execute only (no write)

0 (others) → no permissions

This setup ensures:
Only user2 can modify the script.

Members of accounting (like user1) can execute but not edit it.

Other users have no access, as required.