how i can change pifba by fba-librerto in retropie 3.0 beta for pi 2
<system>
<name>fba</name>
<fullname>Final Burn Alpha</fullname>
<path>~/RetroPie/roms/fba</path>
<extension>.fba .zip .FBA .ZIP</extension>
<command>/opt/retropie/supplementary/runcommand/runcommand.sh 0 _SYS_ fba %ROM%</command>
<platform>arcade</platform>
<theme>fba</theme>
who is the command . thx