Solved Input Redirect

[Phishfry]

I am having trouble getting a pipe to work with a Input Redirect.

Sample:
gpiolcd < /var/log/messages | tail -n 4

I tried:
gpiolcd < {/var/log/messages | tail -n 4}
gpiolcd < /var/log/messages | "tail -n 4"
gpiolcd < "/var/log/messages | tail -n 4"
gpiolcd < /var/log/messages > tail -n 4

I can display messages fine but it is a huge file. How can I use tail -n 4 or similar to parse messages output?
This works:
cat /var/log/messages | tail -n 4
How do I combine the right side of the input redirect together?

 

[covacat]

tail -4 /var/log/messages|gpiolcd

 

[Phishfry]

tail -n 4 /var/log/messages | /usr/local/sbin/gpiolcd -h 4 -w 20 -f /dev/gpioc5

https://www.cs.colostate.edu/~mcrob/toolbox/unix/redirection

 

[Phishfry]

OK how do I strip the first 20 characters off each line?

 

[Phishfry]

tail -n 4 /var/log/messages | cut -c 35- | /usr/local/sbin/gpiolcd -h 4 -w 20 -f /dev/gpioc5