finger:tldr:0632a

The command you mentioned is a shell command that uses the "finger" utility to retrieve information about a specific user on a remote system. Let's break it down:

1. "finger": "finger" is a program/utility commonly found on Unix-like operating systems. It is used to retrieve information about users logged into a particular machine or information about a specific user.

2. "${user}@${host}": This part of the command uses variables to specify the user and host. The "$" signifies that "user" and "host" are variables, and their values will be substituted when the command is run.

   • "${user}": Refers to the username for which you want to retrieve information. You need to replace "${user}" with the actual username you want to check.

   • "@": Is a separator used to separate the username from the hostname.

   • "${host}": Refers to the hostname or IP address of the remote system. You need to replace "${host}" with the actual hostname or IP address.

To summarize, when you run the command "finger ${user}@${host}", it will retrieve the information regarding the specified user on the specified remote system.