There are two Linux command to switch to other users account or execute command as another user: su and sudo.
The key difference is that to use su commands you have to know another user password, but to use sudo your don't to need know the password of the other user (when using sudo you are prompted for your password).
The sudo configuration controlled by the system administrators (file /etc/sudoers).
Examples:su username - run command as username
su - username - login to username account with username's environment
su - user1 -c ls - execute ls command as user1 in user1's home directory
sudo -l - list all available commands
sudo command - run command as root
sudo -u user command - run command as user
sudo su - switch to superuser account
sudo su - - switch to superuser account with root's environment
visudo command - starts vi to edit /etc/sudoers file (root privileges required)
admin ALL=(ALL)[NOPASSWD:]ALL - allow user admin from all hosts to execute all command as root without
operator webserver1=/usr/sbin/poweroff - allow user operator to power off server webserver1