abbr:tldr:5b847
This command is using SSH to connect to a remote system specified by the host_name variable. Once connected, it executes the command abbr --show on the remote system.
The abbr --show command is likely a custom or installed script or program that displays abbreviations or shortcuts configured on the remote system.
The | source part of the command is a pipeline operator that takes the output of the previous command (abbr --show) and passes it to the source command. The source command is used to read and execute the commands from a file in the current shell environment.
Therefore, the overall purpose of this command is to connect to a remote system over SSH, execute a command (abbr --show) that displays abbreviations, and then pass the output of that command to be executed in the local shell environment using the source command.