current_level=`echo $system | awk '{N=split($1,foo,"_"); print N-1}'`

if [ -z "$relative_level" ]; then
  relative_level=0;    
fi

ls $2*_$3.$4  |\
mtt_xargs.sh "ls" "$2*_$3.$4"  |\
awk '{
  level=split($1,foo,"_")-2;
  maxlevel = current_level +  relative_level;
  if (level<=maxlevel) print command, $0, "&";
'} command=$command relative_level=$relative_level current_level=$current_level