sh: 1: Syntax error: "(" unexpected python : I'm executing an awk which looks like this.

`awk '{if(l1){print ($2-l1)/1024" kB/s",($10-l2)/1024" kB/s"} else{l1=$2; l2=$10;}}'     <(grep eth0 /proc/net/dev) <(sleep 1; grep eth0 /proc/net/dev)`

and I always got the `sh: 1: Syntax error: "(" unexpected`
I tried writing it as a .sh file, and tried the different shebang lines.
I need to create a script that will execute this. Somebody ? please, thanks