clementine:tldr:78e07
The command "clementine ${url-or-filename-ext}" is likely used to open a media file or stream a media URL in the Clementine media player.
In this command, "${url-or-filename-ext}" is a placeholder for either a URL of a media file or the filename with its extension. You would need to replace "${url-or-filename-ext}" with the actual URL or filename to make the command work.
For example, if you have a media file called "song.mp3", you would use the command "clementine song.mp3" to open that file in Clementine. Similarly, if you have a streaming URL like "http://example.com/stream.m3u", you would use the command "clementine http://example.com/stream.m3u" to play that URL in Clementine.
By executing this command in a terminal or command prompt, Clementine will launch and automatically start playing the specified media file or stream.