&& and || bash operators

I guess you already know about && operator, which is very common. But || is not so common.

To better illustrate how it works here is an example:

>(exit 1) && echo '0' || echo '1'
1


>(exit 0) && echo '0' || echo '1'
0

also you can do tricks like that

>t=`( echo 'some output'; exit 0) && echo $t || echo 'Error!!!'
some output

>t=`( echo 'some output'; exit 1) && echo $t || echo 'Error!!!'
Error!!!

Very tasty usefulness! Isn't it ?