Shell pipelines or sub-shells

[egrieco]

I'd like to use ripcal to convert the IP ranges in a file on all ASNs into CIDR notation. Unfortunately, ripcal does not have clean output (I may modify it).

Running it with IPs as an argument:

ripcal 1.0.181.0-1.0.182.255
1.0.181.0-1.0.182.255 = 1.0.181.0/22
1.0.181.0/22 = 1.0.180.0 - 1.0.183.255

Running it with IPs passed in on STDIN:

echo "1.0.1.0-1.0.3.255" | ripcal
1.0.1.0/22
1.0.1.0/22 = 1.0.0.0 - 1.0.3.255

So in order to get the output I need, I must run something like echo $1 | ripcal | head -n 1 | tr -d "\n". Unfortunately, I cannot pass this in to teip by enclosing it in quotes and the shell will interpret the pipes such that the output of teip gets piped to head.