The BBC publishes high quality 320 kbps HLS AAC streams that can be used to listen to radio from the command-line using mpv. Here are the URLs and some aliases to start listening quickly.
Tutorial on using more, a UNIX and Linux command for viewing the contents of a file or files one screen at a time. Examples of viewing a file, viewing multiple files, searching using regular expressions and opening the file in a text editor.
Tutorial on using kill, a UNIX and Linux command for terminating a process. Examples of killing a process, sending a SIGTERM, listing signal names and numbers, and handling 'operation not permitted' errors.