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


 
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Operating Systems Linux Thank you radoulov for your help on netcat command (nc -lp)
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Old 07-02-2011
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 Smilie)

Only one hitch. After opening a port [7777 using iptables such as iptables -A INPUT -m state --state NEW -m tcp \
-p tcp --dport 7777 --j ACCEPT ] nmap still showing the port
7777 is closed. [nmap -p 7777 localhost]

---------- Post updated at 06:00 AM ---------- Previous update was at 04:30 AM ----------

Oh! I have made a conceptual mistake. I have unblocked a port but haven't opened it as unblocking a port doesn't mean opening the port, I have just enable the port to reach for so a service can use it, When a service is running in that port,, then the port is said to be a open port[ listening for a connection]

Last edited by vectrum; 07-02-2011 at 08:09 AM..
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chatwidget(n)					      Composite widget for chat applications					     chatwidget(n)

__________________________________________________________________________________________________________________________________________________

NAME
chatwidget - Provides a multi-paned view suitable for display of chat room or irc channel information SYNOPSIS
package require Tk 8.5 package require chatwidget ?1.0.0? ::chatwidget::chatwidget path ?options? $widget topic command args $widget name nick args $widget message text args $widget hook command args $widget names args $widget entry args $widget chat args _________________________________________________________________ DESCRIPTION
This is a composite widget designed to simplify the construction of chat applications. The widget contains display areas for chat messages, user names and topic and an entry area. It automatically handles colourization of messages per nick and manages nick completion. A system of hooks permit the application author to adjust display features. The main chat display area may be split for use displaying history or for searching. The widget is made up of a number of text widget and panedwindow widgets so that the size of each part of the display may be adjusted by the user. All the text widgets may be accessed via widget passthrough commands if fine adjustment is required. The topic and names sections can also be hidden if desired. COMMANDS
::chatwidget::chatwidget path ?options? Create a new chatwidget using the Tk window id path. Any options provided are currently passed directly to the main chat text wid- get. WIDGET COMMANDS
$widget topic command args The chat widget can display a topic string, for instance the topic or name given to a multi-user chatroom or irc channel. show Enable display of the topic. hide Disable display of the topic set topic Set the topic text to topic. $widget name nick args Control the names and tags associated with names. list ?-full? Returns a list of all the user names from the names view. If ?-full? is given then the list returned is a list of lists where each sublist is made up of the nick followed by any options that have been set on this nick entry. This may be used to exam- ine any application specific options that may be applied to a nick when using the add command. add nick ?options? delete nick $widget message text args Add messages to the display. options are -nick, -time, -type, -mark -tags $widget hook command args Manage hooks. add (message, post names_group, names_nick, chatstate), remove, run $widget names args Passthrough to the name display text widget. See the text widget manual for all available commands. The chatwidget provides two additional commands show and hide which are used to control the display of this element in the widget. $widget entry args Passthrough to the entry text widget. See the text widget manual for all available commands. $widget chat args Passthrough to the chat text widget. See the text widget manual for all available commands. EXAMPLE
chatwidget::chatwidget .chat proc speak {w msg} {$w message $msg -nick user} pack .chat -side top -fill both -expand 1 A more extensive example is available by examining the code for the picoirc program in the tclapps repository which ties the tcllib picoirc package to this chatwidget package to create a simple irc client. SEE ALSO
text(n) KEYWORDS
chat, chatwidget, composite widget, irc, mega-widget, widget chatwidget 1.0.0 chatwidget(n)