Quickly bounce nic over ssh without losing ssh session

The story

If you make changes to a network card settings and need to restart it to take effect, you might find this useful.
Ssh is resilient enough to usually keep your session if you take the card down and up fast enough. Obviously you want to make sure the change you make will not prevent the card from being enabled correctly. I was making changes to my dns settings for the card, and I wanted them to take effect immediately.

The snippet

echo "ifdown eth0; sleep 2; ifup eth0;" > ~/foo.sh; chmod u+x ~/foo.sh; ~/foo.sh
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