watch:tldr:34ee2

The command "watch ${command}" is used in Linux and Unix systems to continuously monitor the output of a specific command.

Here's what each component means:

• "watch" is the command itself. It runs a specified command repeatedly and displays the output in the terminal in real-time.

• "${command}" is a placeholder that should be replaced with the actual command you want to monitor. This can be any valid command or script that you want to constantly observe.

When you execute the "watch ${command}" command, it will continuously run the specified command at regular intervals (usually 2 seconds) and display the output on the screen. The purpose of using "watch" is to easily track the changes in the output of a command over time, without having to manually rerun the command each time.

For example, if you want to monitor the status of a network connection with the "ping" command, you can use "watch ping google.com" to continuously display the ping statistics and track any fluctuations in latency or packet loss.

You can interrupt the execution of "watch" by pressing Ctrl + C in the terminal.