# # netcat––Cat data to a network host and port
APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

netcat--Cat data to a network host and port- by Kevin

I've removed advertising from most of this site and will eventually clean up the few pages where it remains.

While not terribly expensive to maintain, this does cost me something. If I don't get enough donations to cover that expense, I will be shutting the site down in early 2020.

If you found something useful today, please consider a small donation.



Some material is very old and may be incorrect today

© November 2001 Kevin Smith
Smith

Are you looking for FAQ: what is netcat and how do I use it?

Kevin Smith of Shadetree Software has allowed us to mirror this from his site.

This is a slightly newer version that the one currently circulating on the net.

The original version would read standard in and write it to the network port. The new version also monitors the network port for data being returned. Anything read back from the network port is put out on stdout.

Argument handling has been changed slightly


For debug output just use -d instead of -d 1

The space betwen the argument letter and the argument option is now optional.

        netcat -hhost -p9100
    
instead of
        netcat -h host -p 9100
    

Debug output looks like

    echo "`date`\f\c" | netcat -d -hspot -p9100
    Host: spot
    Port: 9100
    gethostbyname(spot)=0x408b10
    ip = 192.168.200.207
    socket()=4
    connect()=0

    >(s0)(r29)(s4)(w29)
    >(s0)(r0)EOF from 0--disconnecting
 

This means





More Articles by © Kevin Smith





Printer Friendly Version

Have you tried Searching this site?

This is a Unix/Linux resource website. It contains technical articles about Unix, Linux and general computing related subjects, opinion, news, help files, how-to's, tutorials and more.

Contact us


Printer Friendly Version





Two years from now, spam will be solved. (Bill Gates, 2004)




Linux posts

Troubleshooting posts


This post tagged:

KevinSmith

Networking

Printing

SCO_OSR5



Unix/Linux Consultants

Skills Tests

Unix/Linux Book Reviews

My Unix/Linux Troubleshooting Book

This site runs on Linode