Android, starting the process that processes the output of the second process

proc = Runtime.getRuntime().exec(new String[]{"ls"}); 

Using the code above, you can run ls, you can also start the process with arguments. But how to run something like this?

 ls | egrep "init|sys" 

This is clearly not going to work:

 proc = Runtime.getRuntime().exec(new String[]{"ls","|","egrep","\"init|sys\""});