chmod 4755 <file_name>

Should set the SUID bit to "root" if the file ownership is root.root.

chmod 2755 <file_name> should set the SGID bit ...

SUID ... Set Root ID
SGID ... Set Group ID.

There isn't much effort in just going

$] su
<pass woed>
#]

And does maintain a certain degree of security ...



jm