Comment by jrockway

This line works:

   nc -l -p 1234 -q 1 > testfile.txt < /dev/null

The other one doesn't.

   alias foobar=nc
   cat testfile.txt | foobar 192.168.2.100 1234

I was hoping that it was a "useless use of cat" filter, but nope. It just doesn't like the bytes nc next to an IPv4 address.

This is also fine, but blocked if you change the slash to a dot:

   nc 192/168.2.100 1234

This works too:

   nc \
   192.168.2.100 1234

OK, that's all for now. Can you believe people pay money for "web application firewalls"?