I need to permit suid for my user account on my ubuntu 13.04.
According to the mount command the bit flag for my account is nosuid.
how do i change it to suid.
Does your system have a separate /home partition? if so it's possible that is mounted with the nosuid for good reasons. If this is just a test, then rather than making any persistent changes to your mount options in /etc/fstab, it should be possible to remount the partition temporarily with the suid enabled using
$ sudo mount -o remount,suid /home
For example (since my home partition is not regularly mounted nosuid I'll do that first, for the sake of illustration):
$ ls -l id_demo
-rwsrwxr-x 1 root root 7394 Sep 21 08:52 id_demo
$
$ sudo mount -o remount,nosuid /home
$ ./id_demo
real uid: 1006
effective uid: 1006
Then testing again after remounting with option suid
$ sudo mount -o remount,suid /home
$ ./id_demo
real uid: 1006
effective uid: 0
Note that chmod u+s should be sufficient for your test (chmod a+s should not be necessary).
