help: Set RIP timer values

delete: touch /tmp/rip-timers.$PPID

end: vtysh -c "configure terminal" -c "router rip" -c "no timers basic"
    if [ -f "/tmp/rip-timers.$PPID" ]; then
       rm -rf /tmp/rip-timers.$PPID
    else
       vtysh -c "configure terminal" -c "router rip"  \
             -c "timers basic $VAR(./update/@) $VAR(./timeout/@) $VAR(./garbage-collection/@)"
    fi
