Loop are used to repeat a block of code or subscript until countdown are completed.

Set loop command:

loop *id *seconds call *subscript

Close Loop command:

close_loop *id

Script example:

make_sub myimg
sub myimg photo_now 640x480 myphoto
# repeat the loop process(myimg) ,and restart each 30 seconds.
loop myloop 30 call myimg
# wait 10 min.
sleep 600

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