Question : unix bash scripting - if statements

I'm having some trouble writing a bash script to monitor a service.

I was writing it like this.

num = ps aux | grep httpd | wc -l

if($num=0)
restart_apache

It doesnt seem to work. Syntax errors. Can someone help me fix that?

FYI: restart_apache is script to just restart apache.

Answer : unix bash scripting - if statements

In a Bourne shell (sh or bash)  script the syntax of the if statement would be:

if [ $num -eq 0 ]; then
  restart_apache
fi