Print only if field is not empty
awk, bash, grep
Solution
awk '{if ($4) print $0;}' < hostlist.txt
does the trick. It's functionally equivalent to the earlier solution but is simpler since you only check for existence rather than matching a regex.
Problem
I have a text file that I want to pull host and IP info from only if the IP exists in column 4. For example: ``` cat hostlist.txt Server One 255.255.255.255 123.123.123.123 Server Two 255.255.255.255 Server Three 255.255.255.255 123.123.123.123 ``` In this case I would only want to see Server One and Three as Server Two has no data in the fourth column.