Bug in bsearch function which failed to detect 'missing' item: fixed by Lionel Debroux, in future RC7.
I forget to add the new command 'menu' in the documentation. It is available since RC1!
Example of use:

echo "#!PedroM" >> file
menu "ls" "ls -h" "cd system" >> file
file

(Ok the construct $( ... ) is missing. I should have added it.)