yank:tldr:a0869

This command consists of two parts:

1. ${sudo dmesg}: This portion retrieves the output of the dmesg command with elevated privileges, using the sudo command. dmesg stands for "display message" and is a command in Linux/Unix systems that displays the kernel ring buffer logs, containing information about the system's hardware, software, and other events.

2. | yank: The vertical bar symbol | is called a pipe and it is used to redirect or "pipe" the standard output of the command on the left to the standard input of the command on the right. In this case, the yank command is used to copy the output of the previous command into the clipboard.

So, in summary, the combined command ${sudo dmesg} | yank runs the dmesg command with elevated privileges, retrieves its output, and then copies that output into the clipboard using the yank command.