cmd:tldr:d7956

The command "cmd /k ${echo Hello world}" is a command intended to be executed in a command prompt or terminal. Here's a breakdown of what each component does:

• "cmd" is the command to run the Windows Command Prompt (cmd.exe) or any other equivalent command-line interpreter available on the system.
• "/k" is an argument for the cmd command, specifying it to execute the following command and remain open afterward.
• "${echo Hello world}" is the command to be executed within the command prompt.

Inside the "${..}" notation, it appears to mimic a variable placeholder, but its purpose depends on the specific context or tool that processes this command. Without proper context, it is difficult to determine the exact meaning or purpose of "${echo Hello world}".

Overall, when you run this command, it will open the command prompt, execute "echo Hello world" (or the determined command based on context), and keep the command prompt window open after displaying the output "Hello world" (if applicable).