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Comment by ksbrooksjr | Hacker News Reader

I didn't know about the /cdn-cgi/trace Cloudflare trick. Here's a one-liner to print just the ip via curl:

  curl -s cloudflare.com/cdn-cgi/trace | grep ip | cut -d "=" -f 2 --

That may return IPv6 if you have IPv6 connectivity, which might not be what you're looking for.

I just do this, myself:

IP=`curl -s checkip.amazonaws.com`

You could use awk instead of grep & cut:

      curl -s cloudflare.com/cdn-cgi/trace | awk '{FS="="} /ip/ {print $2}'

And sed:

    curl -s cloudflare.com/cdn-cgi/trace | sed -nr "s/^ip\=(.+)$/\1/p"

What do those -- at the end do? I get my IP without them.