These scripts are invoked on any status change of the player. Usually they are used to show the current playing song (e.g. to others in an instant messenger, or as popup in a window manager), but they can also do other stuff (e.g. populating the play queue with new songs).
To use the programs, download them and make them executable:
chmod a+x downloaded-file
To use multiple programs, create a shell script, e.g. ~/.cmus/status_display_program.sh, that starts all wanted programs:
#!/bin/sh program1 "$@" & program2 "$@" &
Then in cmus, set the
display_status_program variable to the path of the program or wrapper script: