debian no sound

lsof /dev/snd/*

to find out what program are using sound device, some program might be hanging causing sound not to function

linux grep and sed to find through files and replace a string

grep -rl oldstring path | xargs sed -i 's/oldstring/newstring/g

find /path -type f -exec sed -i 's/oldstring/newstring/g' {} \;

jQuery wait for all images to load before executing

$(window).load(function() {
    // do your thing here
});