cmd:tldr:031fb

The command cmd /c ${echo Hello world} is a command that runs in a Windows command prompt.

Here is a breakdown of each component of the command:

• cmd is the command to run the Windows command prompt.
• /c is an option for the cmd command to specify that it should execute the given command and then terminate.
• ${echo Hello world} is the actual command to be executed.

However, there is a syntax issue with the command. The ${...} notation is typically used in shells like Bash for variable interpolation, but it is not valid in Windows command prompt. The correct syntax in Windows command prompt for echoing a string would be echo Hello world.

So, the corrected and simplified command would be: cmd /c echo Hello world. This command would execute the echo Hello world command in a Windows command prompt, which would output the string "Hello world" to the console.