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NOPASSWD

Allowing users to run commands without having to enter their password. Use wisely!

Synergy

An example using synergy without a password. 

sudo /usr/sbin/visudo
<username> localhost = NOPASSWD: /usr/bin/synergyc *

or

Shutdown

User_Alias USERS = username
Cmnd_Alias SHUTDOWN = /sbin/shutdown
USERS ALL = NOPASSWD: SHUTDOWN
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