SERVER:

> netcat -l -p 3333
asdf
asdf
>

CLIENT:

> netcat localhost 3333
asdf
asdf
 punt!
>

—> To write output of incoming connections to file:

> netcat -l -p PORT > OUTFILE

—> To respawn netcat server, after connection has been closed: —> Attention: in order to get rid of process you have to kill -9 parent shell!

> while true; do netcat -l -p 3333; done

—> To transmit output of a commando to a server

> COMMAND | netcat IP PORT

—> If compiled with -DGAPING_SECURITY_HOLE the -e switch works: on new connection executable is called without parameters !

> netcate -l -p PORT -e EXECUTABLE

—> Send text to client

> echo MYTEXT | netcat -l -p PORT

----------------------------> Comunication with netcat:

SERVER:

 > netcat -l -p 3333
Hallo
Hi du
Wie geht's!
GUAAT..
 punt!
 >

CLIENT:

arno@geaeini: arno> netcat localhost 3333
Hallo
Hi du
Wie geht's!
GUAAT..
 >

-----------------------------> Cmd-Line:

CLIENT:

 > nc
Cmd line: localhost 3333
Hi
du
Ei
!
 punt!
 >

SERVER:

 > netcat -l -p 3333
Hi
du
Ei
!
 >

----------------------------> Puttin input in fifo and parsing output

> mkfifo fifi

SERVER:

 > netcat -l -p 3333 > fifi &

CLIENT:

 > netcat localhost 3333
line 1
line 2
line 3
line 4
line 5
line 6
 punt!
 >

PARSER:

 > X=0
 > cat fifi | while read line; do echo $X: $line; let X=X+1; done
0: line 1
1: line 2
2: line 3
3: line 4
4: line 5
5: line 6

----------------------> Why does this not work?

CLIENT SENDING:

 > netcat localhost 3333
line 1
 > Line 4 received
line 2
line 3
 punt!
 >

PARSER:

 > cat IN | while read line; do echo "> Line $X received" > OUT ; echo $line;  let X=X+1; done
line 1

SERVER:

 > cat OUT | netcat -l -p 3333 > IN &
[1] 13345
arno@geaeini: tmp>

documented on: 2003.12.10 Wed