In the Unix environment, you are able to use a tool called finger to list user information. Although this is a dangerous command to leave unsecured, it's helpful to some degree. Most times, finger is disabled because if left open and unmanaged, it can be exploited. For this reason, we will not spend too much time on finger; you most likely may not even be able to use it on your system. If you can, you will see that in cases in which no other way to list information is available (like an email or messaging application), finger does the job quite nicely.
How does finger work? To put it in simple terms, information about each user's physical address is stored as part of the user's system password file when populating the