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This is to fetch the Gateway Ip Address of a machine. Use the below format to put the value in a variable if you wish to find the gateway ip in a script
GATEWAY=$(netstat -nr | awk 'BEGIN {while ($3!="0.0.0.0") getline; print $2}')
Please install aria2c before you try the above command. On ubuntu the command to install aria2c would be:
sudo aptitude install aria2