UNIX Command $ls a1.txt a2.txt $ls -n total 4 -rw-r–r– 1 1000 1000 0 Feb 19 22:30 a1.txt -rw-r–r– 1 1000 1000 2 Feb 19 22:31 a2.txt $id a1.txt id: a1.txt: No such user $id jeffrin uid=1000(jeffrin) gid=1000(jeffrin) groups=1000(jeffrin),29(audio),33(www-data),1001(wireshark),119(mysql) $ Unix Explanation -n, –numeric-uid-gid like -l, but list numeric user and group IDs Theory Drop …