Setting SUID and SGID attributes on executable files : chmod u+s, chmod g+s

By default, when a user executes a file, the process which results in this execution has the same permissions as those of the user. In fact, the process inherits his default group and user identification.

If you set the SUID attribute on an executable file, the process resulting in its execution doesn't use the user's identification but the user identification of the file owner.

For instance, consider the script...

 Remove package called httpd, enter:

# yum remove {package-name-1} {package-name-2}
# yum remove httpdTask: Display the list of available packages

# yum list allTask: Display list of group software

Type the following command:
# yum grouplist
Output:

Installed Groups: Engineering and Scientific MySQL Database Editors System Tools Text-based Internet Legacy Network Server DNS Name Server Dialup Networking Support FTP Server Network Servers Legacy Software Development...