Upgraded from CentOS 6 to 7 and nc was replaced with ncat. nc has an option, -d, which won't try to read from STDIN. -d in ncat, is a delay flag. Changing option flags would be perfectly okay if there was a corresponding option. The main problem is that when I run a bash script non-interactively that has ncat listen, it immediately exits "NCAT DEBUG: EOF on stdin". I've been unsuccessful in a workaround short of building the older nc for CentOS 7.