Larger Script Organization

Main Dispatch

Route a Command

A larger script can keep argument routing separate from the functions that do real work. The dispatch table maps a command to a handler.

Program

Play the script to choose the command and see the selected handler.

main_dispatch_plan.sh 
#!/usr/bin/env bash

command=
case "$command" in
    build) handler="run_build" ;;
    clean) handler="run_clean" ;;
esac
echo "$command -> $handler"

#!/usr/bin/env bash

command=
case "$command" in
    build) handler="run_build" ;;
    clean) handler="run_clean" ;;
esac
echo "$command -> $handler"
dispatch Dispatch selects the handler for a named command.
handler A handler function contains the command-specific work.
main function A main function can parse, dispatch, and report without mixing every detail together.