Question

I want to do this in bash:

   //C pseudo code
   if(cond1 is true and (cond2 is true or cond3 is true))
       do something

This is what is have

var1=abc
var2=
if echo "$var1" | grep -q 'abc' && ( echo "$var2" | grep 'def' || [ "x$var2" = "x" ] ) 
then
 echo hello
fi

This still prints hello.

I really need to use the echo grep construct. What should I do?

Answer 1

It correctly prints hello because [ "x$var2" = "x" ] is true when var2 is the empty string.