Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: netcat
Top Forums Shell Programming and Scripting netcat Post 302227737 by era on Thursday 21st of August 2008 11:53:55 PM
Old 08-22-2008
On the face of it, looks okay. You could probably avoid at least some amount of temporary files by using pipelines instead.

Code:
DO_SOME_STUFF | nc -w 1 "$remote_host" "$port"

The Useless Use of Test $? is also something I personally try to avoid.

Code:
if echo "$data|$thisMachine" | nc -w 1 "$host" "$port"
then
  # wait for data
  nc -l -p "$port" >"output.file";
fi

or even more succinctly

Code:
echo "$data|$thisMachine" | nc -w 1 "$host" "$port" && nc -l -p "$port" >"output.file"

Finally, there's a Useless Use of Echo which is kind of silly.

Code:
thisMachine=$(/sbin/ifconfig eth0 | grep "inet addr" | cut -d ":" -f 2 | cut -d " " -f 1)

But these are merely stylistic issues. (Haven't actually tested your code, though)

My compliments for the judicious use of double quotes; they're a bit on the paranoid side when the strings do not contain any whitespace or variable interpolations, but better safe than sorry.
Last edited by era; 08-22-2008 at 01:00 AM.. Reason: Note Useless Use of Echo, too
 

10 More Discussions You Might Find Interesting

1. Programming

netcat like file transfer

Hi Folks I am not a c programmer .But i need help in writing a program which can do this any ideas on how to go about it . i start a server on the target server where files need to be copied start-server -port 5006 & ---start the server and listen it on a partcular port on the source... (2 Replies)
Discussion started by: linuxdba
2 Replies

2. UNIX for Advanced & Expert Users

Netcat with Authentication?

I'd like to do a data transfer without encryption but with a guarantee that my data comes from a legit source. I'm thinking something that uses a public key scheme to sign the data. Does anyone know of something like that? Thanks! -Pileofrogs (1 Reply)
Discussion started by: pileofrogs
1 Replies

3. UNIX and Linux Applications

netcat prints blank pages

Please direct me to the right forum tree if i am in the wrong section for this. i have netcat on a unix machine and there is no man nc or man netcat available. my command i am using is: cat $FILE1 | netcat -h $PRINTER -p 9100 (-h -p -d are the only flags available in this version of... (3 Replies)
Discussion started by: dunpealslyr
3 Replies

4. Solaris

Please help me to install netcat on solaris

hello guys, i want to install netcat on my solaris. after i tar and gunzip netcat i'm confuse what do i must to do ? please help me to install netcat on my solaris. I'm beginner :( (2 Replies)
Discussion started by: praset
2 Replies

5. Linux

Thank you radoulov for your help on netcat command (nc -lp)

Hello, Thank you very much for the line nc -lp <port> . I tried to run simple chat session with nc as it's shown in catonmatDOTorg but failed miserably with that syntax inspite of opening port 7777 by iptables . But your command example is working nicely. So a bagful of thanks :)) Only one... (0 Replies)
Discussion started by: vectrum
0 Replies

6. Shell Programming and Scripting

Post using nc(netcat)

Hi; I have a url like http://localhost:8080/examples/jsp/dates/nextPageToPost.jsp?name=ajay&password=pas&sex=Male&check=on&nationality=USA&description=aa&submit=submit in which i want to use nc for http post for parameters like "name","password"....etc can neone please help me how to do that... (3 Replies)
Discussion started by: ajaypadvi
3 Replies

7. IP Networking

nc (netcat): Connection refused problem

From my machine (ubuntu), I can do $ nc somemachine 80 But, when I want to connect to other machine that runs nc on different ports, it throws "Connection refused" error. The same error occurs on my local machine. For example, nc -l 5555 nc x.x.x.x 5555 --> this throws "Connection... (2 Replies)
Discussion started by: dinga
2 Replies

8. IP Networking

Help with Netcat

Hi all, I know my question is regarding Windows and not Linux, but I simply need people who know Netcat pretty well and I'm guessing here is a good place for that. So on with my question. I'm doing some research, and I was playing around with netcat on a WinXP VM but I can't seem to get... (0 Replies)
Discussion started by: MrCrumbs
0 Replies

9. UNIX for Advanced & Expert Users

Telnet vs netcat behavior

Currently I run a number of network tests using netcat that checks for an open port on a remote IP-address, using this syntax: netcat -v -w 5 -z 107.249.95.5 4488 For some reason, the netcat command above is hanging (although others work fine), but a telnet is showing a valid connection like... (4 Replies)
Discussion started by: ckmehta
4 Replies

10. Emergency UNIX and Linux Support

Netcat ( nc -l ) as webserver

Dear Linux guru's I am trying to create a webserver using nc (netcat only) on RHEL 7.2 running on bash shell. now the easy thing is to get nc listing to a port and respond back $ while true; do { echo -e 'HTTP/1.0 200 OK\r\n'; set; } | nc -l 7877; done This when called from a... (3 Replies)
Discussion started by: chakrapani
3 Replies

LEARN ABOUT DEBIAN

irsend

IRSEND(1)							   User Commands							 IRSEND(1)

NAME

       irsend - basic LIRC program to send infra-red commands

SYNOPSIS

       irsend [options] DIRECTIVE REMOTE CODE [CODE...]

DESCRIPTION

       Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such
       as TV boxes, HiFi sets, etc.

       DIRECTIVE can be:
	  SEND_ONCE	    - send CODE [CODE ...] once
	  SEND_START	    - start repeating CODE
	  SEND_STOP	    - stop repeating CODE
	  LIST		    - list configured remote items
	  SET_TRANSMITTERS  - set transmitters NUM [NUM ...]
	  SIMULATE	    - simulate IR event

       REMOTE is the name of a remote, as described in the lircd configuration file.

       CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file.

       NUM is the transmitter number of the hardware device.

       For the LIST DIRECTIVE, REMOTE and/or CODE can be empty:

	  LIST	 ""    ""   - list all configured remote names
	  LIST REMOTE  ""   - list all codes of REMOTE
	  LIST REMOTE CODE  - list only CODE of REMOTE

       The SIMULATE command only works if it has been explicitly enabled in lircd.

       -h --help
	      display usage summary

       -v --version
	      display version

       -d --device
	      use given lircd socket [/var/run/lirc/lircd]

       -a --address=host[:port]
	      connect to lircd at this address

       -# --count=n
	      send command n times

EXAMPLES

	  irsend LIST DenonTuner ""
	  irsend SEND_ONCE  DenonTuner PROG-SCAN
	  irsend SEND_ONCE  OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP
	  irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3
	  irsend SEND_STOP  OnkyoAmpli VOL-DOWN
	  irsend SET_TRANSMITTERS 1
	  irsend SET_TRANSMITTERS 1 3 4
	  irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S"

FILES

       /etc/lirc/lircd.conf
	      Default lircd configuration file.  It should contain all the remotes, their infra-red codes and the corresponding timing	and  wave-
	      form details.

DIAGNOSTICS

       If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics:
       "irsend: could not connect to socket"
       "irsend: Connection refused" (or "Permission denied").

SEE ALSO

       The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory.

       lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org.

irsend 0.9.0-pre1						   October 2010 							 IRSEND(1)
All times are GMT -4. The time now is 02:19 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy