There is a nice program on my PC - niceprogram.
While it runs smoothely with user ID 501 (userA), it doesn't run with user ID 502 (userB).

There is no problem when userA is logged into the machine. The problem is with the userB. The work around I found till now is to type into the terminal:
$ su userA
password:
$ niceprogram

I wonder if there is way to combine all three steps into one step?

Maybe it has something to do with setuid?
Maybe, a little #bin/bash will do the job?

userB is not a root, the program is owned by the root, I guess, though it was installed by userA.

Any comment?

To cut it to two steps:

su userA -c niceprogram

you still have to enter the password

To do it in one step, edit your /etc/sudoers file so you can do:

sudo niceprogram

Post the output of
ls -l
of the file and the directory it lives in?


Cheers,
Tink

ls -l

-rwxr-xr-x 1 root root 1145985 Jul 7 22:41 gjiten*


Here it is. The program is gjiten