lsattr /etc/pgbouncer/users.txt ----i--------e- /etc/pgbouncer/users.txt lsattr /etc/pgbouncer/users.txt ----i--------e- /etc/pgbouncer/users.txt sudo chattr -i /etc/pgbouncer/users.txt lsattr /etc/pgbouncer/users.txt -------------e- /etc/pgbouncer/users.txt vim /etc/pgbouncer/users.txt sudo chattr +i /etc/pgbouncer/users.txt lsattr /etc/pgbouncer/users.txt ----i--------e- /etc/pgbouncer/users.txt