I believe that will nexec the "head" command as well. In that case, it'll run the remote head command on each server. Since you don't know which version it's running, it may behave unpredictably.
Similarly, it could be (and on second thought, more likely is) the nl command that is different on the remote servers. You could avoid this by using "cat -n //HOST/var/opt/ignite/local/install.log" instead, as then you'll be using the same cat command in each instance.
Awesome. Thanks Jarrod!