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Full Discussion: Telnetable script on a port
Top Forums Shell Programming and Scripting Telnetable script on a port Post 302574537 by Corona688 on Thursday 17th of November 2011 12:41:09 PM
Old 11-17-2011
Code:
nc -l -e /bin/cat -p 1234

This will cause netcat to run /bin/cat whenever something connects to it, feeding the sockets input into cat, and feeding cat's output back into the socket. Try telnetting to localhost port 9000 1234 and typing lines into it, it'll spit them back to you. ( but be sure to keep a way to kill nc handy as telnet won't know when to quit!).

It can as easily run a shell script as cat.

Last edited by Corona688; 11-21-2011 at 11:58 AM..
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat - catenate and print SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ... DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus cat file displays the file on the standard output, and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely unbuffered. The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n option omits the line numbers from blank lines. The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced. The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char- acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t option with the -v option displays tab characters as ^I. SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1) BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them. 4th Berkeley Distribution May 5, 1986 CAT(1)
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