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  • # uname -a Linux 2.6.32-504.el6.x86_64 #1 SMP Tue Sep 16 01:56:35 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux Commented Mar 31, 2015 at 13:35
  • # cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.6 (Santiago) Commented Mar 31, 2015 at 13:39
  • Name : nc Arch : x86_64 Version : 1.84 Release : 22.el6 Size : 109 k Repo : installed From repo : RHELServer Summary : Reads and writes data across network connections using TCP or UDP URL : openbsd.org/cgi-bin/cvsweb/src/usr.bin/nc Commented Mar 31, 2015 at 13:39
  • Please provide the full output from running nc -h. I suspect you're running busybox nc, which doesn't support -k. Regular nc has supported the -k option since at least 2001 source. Commented Mar 31, 2015 at 15:00
  • Where "regular" means the OpenBSD version, that everybody these days seems to use, rather than nc110 from 1996. Commented Mar 31, 2015 at 15:08