Recently while crafting a Vagrantfile I came across the need of checking if I had already added a route to my host when reload the vagrant box.
- -r shows the routing table
- -n shows the network addresses as number
Matching the pattern
grep -co '172.17 *192.168.14.10'
- -c writes the number of matches to stdout
- -o prints only the matching part of the line
Putting both commands together
if [ $(netstat -nr | grep -co '172.17 *192.168.14.10') = 0 ]; then echo 'Adding gateway route for docker0 network' sudo route -n add 172.17.0.0/16 " + $vb_ip_address + " fi