button override

[FUZIK]

on my cam broken 'shutter' button. I have an idea override 'switch button' button to shutter.

'switch button' -> one click = shutter
                   two click = switch mode

who can help me understand gpio command in .sh?

 

[FUZIK]

my sample spaghetti code

#!/bin/sh

while true
    if (state of swith button) != 0
        swith button # or cancel switch
        if(firstclick == 1)
            shutter button
        else
            click_check()


click_check()
    if(firstclick == 0)
        firstclick -> 1
        wait 0.3 # seconds
        firstclick -> 0