How to change default gateway temporarily in linux

#route del default  ( To delete default gateway temporary)

#route -n    (To display default gateway in machine )

#route add default gw 192.168.0.254 ( To add temp default gateway )

#route -n

Delete Specific gateway 

#route del default gw 192.168.0.253

Note : This requirement come in industry when the internet connection down and need to change another default gateway.