help: Redistribute kernel routes

delete: touch /tmp/rip-redist-kernel.$PPID

end: vtysh -c "configure terminal" \
       -c "router ripng"                                       \
       -c "no redistribute kernel";
     if [ -f "/tmp/rip-redist-kernel.$PPID" ]; then
        rm -rf /tmp/rip-redist-kernel.$PPID;
     else
        if [ -n "$VAR(./metric/@)" ]; then
          COND="metric $VAR(./metric/@)";
        fi;
        if [ -n "$VAR(./route-map/@)" ]; then
          COND="$COND route-map $VAR(./route-map/@)";
        fi;
        vtysh -c "configure terminal" \
          -c "router ripng"                                       \
          -c "redistribute kernel $COND";
     fi;