Also don't forget to remove the file descriptor once you don't need it anymore: $ rm -f /tmp/fĮmulating netcat -e, How can I emulate netcat -e with a version of netcat that does not have the -e option ? I need to trigger a command remotely. Use -k if you want it keep listening, but if the command quits this option won't restart it or keep nc running.

There's no 'standard' that describes which options netcat has to support, unlike many other When connection is terminated, nc quits as well. Why is the '-e' option missing from netcat-openbsd?, Because there are various versions of the program.

Useful Netcat Examples In this netcat tutorial you can see On my Ubuntu system, there are 2 packages netcat nc: invalid option - ‘e’ Useful Netcat Examples and Tutorial. Install the version of netcat developed by. Remote port number can also be specified as range.Invalid option -e in netcat, There are multiple variants of netcat. z, -zero zero-I/O mode (used for scanning) w, -wait=SECS timeout for connects and final net reads x, -hexdump hexdump incoming and outgoing traffic V, -version output version information and exit v, -verbose verbose (use twice to be more verbose) T, -telnet answer using TELNET negotiation s, -source=ADDRESS local source address (ip or hostname) r, -randomize randomize local and remote ports o, -output=FILE output hexdump traffic to FILE (implies -x) n, -dont-resolve numeric-only IP addresses, no DNS L, -tunnel=ADDRESS:PORT forward local port to remote address l, -listen listen mode, for inbound connects i, -interval=SECS delay interval for lines sent, ports scanned G, -pointer=NUM source-routing pointer: 4, 8, 12. g, -gateway=LIST source-routing hop point, up to 8 e, -exec=PROGRAM program to exec after connect c, -close close connection on EOF from stdin Mandatory arguments to long options are mandatory for short options too. netcat/bin/netcat -L hostname:port -p port GNU netcat 0.7.1, a rewrite of the famous networking tool.Ĭonnect to somewhere. Netcat 0.7.1 compiled from the source code. Netcat that installed on Ubuntu 20.04.01: netcat -help Netcat command that installed on Ubuntu 20.04.01 by default has -X option, but netcat 0.7.1 compiled from source code does not have -X option.

Netcat command linux