We’ve been configuring netcat to listen for connections in order to communicate and transfer files. This is basically functions similarly to the old Linux telnet command. -e /bin/bash) which gives them terminal access. On one machine, you can tell netcat to listen to a specific port for connections. Listen to a certain port for any inbound connections. As a regular (non-root) user, you will not be able to open any ports under 1000, as a security measure. First I was very disappointed, but realistically telnet is history.. We can stop the loop by typing CTRL-C on the server. NBTscan is a program for scanning IP networks for NetBIOS name information. We can send the standard error messages to standard out, which will allow us to filter the results easier. For each responded host it lists IP address, NetBIOS computer name, logged-in user name and MAC address. In this guide, we will discuss how to use the netcat utility. Unlike telnet(1), ncscripts nicely, and separates error messages onto standard error instead of sending them to standard output. 2. Skilled system administrators can do much of their work using the built-in tools without having to install additional software. This will provide a remote shell to the client, from where the client can execute shell command on the server. Get the latest tutorials on SysAdmin and open source topics. You should now have a pretty good idea as to what netcat can be used for. One of its most practical uses is to transfer files. This can be useful for testing pages that you are creating. Common use cases for Netcat are; We can choose port 8888 as a regular user. Keep in mind that your connection is entirely unencrypted. It is designed to be a reliable back-end tool to instantly provide network connectivity to other applications and users. In this post, we will learn how to use Netcat windows and netcat linux version.. Although netcat is probably not the most sophisticated tool for the job (nmap is a better choice in most cases), it can perform simple port scans to easily identify open ports. It is a versatile tool that can be useful to diagnose problems and verify that base-level functionality is working correctly with TCP/UDP connections. It aims to be your network Swiss Army knife, handling a wide variety of security testing and administration tasks. Ncat was written for the Nmap Project and is the culmination of the currently splintered family of Netcat incarnations. On the side with the directory contents we want to transfer, we can pack them into a tarball and then send them to the remote computer through netcat: This time, the dash in the tar command means to tar and zip the contents of the current directory (as specified by the * wildcard), and write the result to standard output. If we look at Figure 13.3, we see the results of an Nmap scan against the Hackerdemia server, which has numerous ports available in which to connect. We do this by specifying a range of ports to scan, as we did above, along with the -z option to perform a scan instead of attempting to initiate a connection. As you can see, this provides a lot of information and will tell you for each port whether a scan was successful or not. Some important options that can be used with Netcat: 1. On the receiving end running, nc -l -p 1234 > out.file will begin listening on port 1234. Listen to a certain port for any inbound connections. ... (Verify server certificates) In client mode, --ssl-verify is like - … Linux is known for having a great number of mature, useful command line utilities available out of the box in most distributions. You can open a listener, proxy connections, open a connection to another device, and port scan a device. However, instead of printing information onto the screen, as we did in the last example, we will place all of the information straight into a file: On the second computer, create a simple text file by typing: We can now use this file as an input for the netcat connection we will establish to the listening computer. R ecently I just noticed in Mac and Ubuntu that I have, -e (execute) switch in Netcat has been disabl e d. I know it is a gasping security issue to have it enabled as someone who can get access to our system now can extend their footing by executing Netcat with -e switch (e.g. It can be used for just about anything involving TCP or UDP. If the file is not in the current directory, then specify the entire path. Following tasks can be done easily with Netcat: A simple client-server connection: Type this command on the server machine. 5. Use nc command for port scanning. Python script to change MAC address of Linux machine, Display Hostname and IP address in Python, Python Desktop News Notifier in 20 lines, Socket Programming with Multi-threading in Python, Multithreading in Python | Set 2 (Synchronization), Synchronization and Pooling of processes in Python, Multiprocessing in Python | Set 1 (Introduction), Multiprocessing in Python | Set 2 (Communication between processes), Difference Between Multithreading vs Multiprocessing in Python, Difference between Multiprocessing and Multithreading, Difference between Multiprogramming, multitasking, multithreading and multiprocessing, Write Interview nc can open TCP connections, send UDP packets, listen on arbitrary TCP and UDP ports, perform port scanning, and deal with both IPv4 and IPv6. Netcat Tutorial:- Netcat, also known as the Swiss army knife for hackers.It’s a networking tool or a utility which is used to read and write data by initiating a connection over TCP and UDP port. Ubuntu ships with the BSD variant of netcat, and this is what we will be using in this guide. However, your scan will go much faster if you know the IP address that you need. Netcat (Mac OS-X) Unsurprisingly, as OS-X is a BSD UNIX derivative, Netcat is available out of the box on this platform with the minor difference from Linux that the command is actually called nc rather than netcat. Netcat is a Unix utility which reads and writes data across network connections using TCP or UDP protocol. The Netcat utility program supports a wide range of commands to manage networks and monitor the flow of traffic data between systems. You can then use the -n flag to specify that you do not need to resolve the IP address using DNS: The messages returned are actually sent to standard error (see our I/O redirection article for more info). We will then filter the results with grep: Here, we can see that the only port open in the range of 1-1000 on the remote computer is port 22, the traditional SSH port. This will create a TCP connection with the IP address(that is, 127.0.0.1) on the specified port(that is, 1234). We will redirect standard error to standard output using the 2>&1 bash syntax. To perform simple chat and data transfer, Use the above sequence of command to send the messages or data from one terminal and one ip to the other. Netcat is a platform-independent command supported by Linux, Unix, Windows, BSD, macOS, etc. We can use this knowledge to turn netcat into a file transfer program. Please use ide.geeksforgeeks.org, netcat mac free download. If you are actually using a domain name, this is the form you will have to use. On most systems, we can use either netcat or nc interchangeably. Sun Solaris 11 is another operating system implemented by Netcat developers. Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" | netcat -l 8888, while true; do printf 'HTTP/1.1 200 OK\n\n%s' "$(cat index.html)" | netcat -l 8888; done. DigitalOcean makes it simple to launch in the cloud and scale up as you grow â whether youâre running one virtual machine or ten thousand. At the same time, it is a feature-rich network debuggingand exploration tool since it can create almost any kind of connection you would need and has several interesting built-in capabilities. Ncat was written for the Nmap Project as a much-improved reimplementation of the venerable Netcat. Contribute to Open Source. Creating a Simple Chat with netcat in Linux, Basic System Controls with Terminal in Linux, Getting System and Process Information Using C Programming and Shell in Linux, Difference Between Single and Double Quotes in Shell Script and Linux, Initializing and Cache Mechanism in Linux Kernel, Reset a lost Linux administrative password and Explanation. Hacktoberfest On one console, start nc listening on a specific port for a connection: # On a computer A with IP 10.10.10.10 we listen on port 64 $ nc -l -p 64 Experience. How To Use Netcat as a Simple Web Server We’ve been configuring netcat to listen for connections in order to communicate and transfer files. However, you can now send messages on either side of the connection and they will be seen on either end. Often referred to as a Swiss army knife of networking tools, this versatile command can assist you in monitoring, testing, and sending data across network connections. Computer networks, including the world wide web, are built on the backbone of the Transmission Control … /bin/sh is a Unix command which provides a shell to execute shell commands. Netcat is a Unix utility which reads and writes data across network connections using TCP or UDP protocol. 1. simple TCP proxies 2. shell-script based HTTP clients and servers 3. network daemon testing 4. a SOCKS or HTTP ProxyCommand for ssh(1) The nc … To establish a UDP connection. There might be more efficient options for port scanning, but it … Because we are establishing a regular TCP connection, we can transmit just about any kind of information over that connection. Practical Uses of nc(netcat) command in Linux. We do this the same way we’ve been establishing connections previously: It will look as if nothing has happened. linux-notebook% netcat 192.168.240.1 6666 Upon connecting to the Yun server, I could then send commands like “1l”, “90A”, “180B”, and so on. By default, netcat operates by initiating a TCP connection to a remote host. This is just one example of transferring more complex data from one computer to another. How to Change the Mac Address in Kali Linux Using Macchanger? How to Code Your Own Port Scanner Using BASH Script and netcat Tool in Linux? They are aliases for the same command. Netcat is a utility that reads and writes data across network connections, using the TCP or UDP protocol. The file will be transmitted just as if we had typed it interactively: We can see on the computer that was awaiting a connection, that we now have a new file called “received_file” with the contents of the file we typed on the other computer: As you can see, by piping things, we can easily take advantage of this connection to transfer all kinds of things. By default, Netcat uses TCP connection. First, let’s make a simple HTML file on one server: Here is some simple HTML that you can use in your file: Without root privileges, you cannot serve this file on the default web port, port 80. 3. Here's how to create UDP syslog messages via nc, netcat: echo '<14>sourcehost message text' | nc -v -u -w 0 localhost 514 Replace localhost with the syslog server, of course. When I tried to connect to the server via: nc -v localhost -p 3456. One of the most common uses for netcat is as a port scanner. Ncat is suitable for interactive use or as … After data transfer wait w seconds before terminating the connection. Netcat is the Swiss Army knife of networking utilities. To use netcat as a backdoor, we need to have a way to direct all communication through netcat into a shell or command prompt. This command can also be used to scan a port of the server if it is open or not. ... (Windows,Mac OS X, Linux). Network engineers often use telnet to establish a connection to a service on a remote server. We can use this same concept to operate netcat as a very simple web server. On the sending end running, This gives us the opportunity to connect two instances of netcat in a client-server relationship. Simple TCP proxies 2. Hub for Good Verbose, prints additional information about the connection. When you are finished passing messages, you can press CTRL-D to close the TCP connection. Can execute programs and scripts of the client on the server and vice versa. Transfer files across the network once the connection is established. This allows you to see how a page renders in a browser, but it doesn’t provide much more functionality. A Netcat variant can be installed through such package management system. Can Provide remote shell access of server to a client where shell commands can be executed. Netcat attempts to make network interactions transparent between computers by taking the complexity out of forming connections. For instance, we can scan all ports up to 1000 by issuing this command: Along with the -z option, we have also specified the -v option to tell netcat to provide more verbose information. // on external client run "double server". "sourcehost" is a string identifying the source; can be anything. On the client: Send to the server machine that's listening for UDP on port 33001 (in this case IP 10.0.101.49) at 10 Mbps: iperf -c 10.0.101.49 -u -p 33001 -b 10M Option 2: Netcat. This can be useful for testing pages that you are creating. Send data across client and server once the connection is established. On Linux and Mac OS X systems netcat is usually already available or it can be installed as: On a second server, we can connect to the first machine on the port number we choose. I'm just trying to get netcat to respond to an incoming curl request, but I think the problem I'm having is that netcat doesn't know when to respond. Type a message and press ENTER. We will be exploring this on an Ubuntu 12.04 VPS, but netcat should be available on almost any modern Linux distribution. This will attempt to initiate a TCP to the defined host on the port number specified. Basically, I captured some packets that a remote control sends over a wifi network to turn lights on and off (using X10 controllers), and am looking for a way to replay them by crafting a TCP packet from the command line. Working on improving health and education, reducing inequality, and spurring economic growth? Ncat is a feature-packed networking utility which reads and writes data across networks from the command line. nc is a Swiss Army knife utility to write and read data across TCP and UDP network connections. The 14 is a combination of the severity (low 3 bits) and the service (high N… Here, nc stands for Netcat, that we are calling the Netcat program. this process waits for a // connection from localhost on port 10023, and, when it is established, waits // … Netcat is like a swiss army knife for geeks. Sign up for Infrastructure as a Newsletter. Netcat is cross-platform, and it is available for Linux, macOS, Windows, and BSD. This command is also used to create a reverse shell. Using netcat, you can check if a single or multiple or a range of open ports as follows.The command below will help us see if the port 22 is open on the host 192.168.56.10: $ nc -zv 192.168.1.15 22 In the command above, the flag:-z – sets nc to simply scan for listening daemons, without actually sending any data to them.-v – enables verbose mode. By using our site, you Great! Netcat is also called a swiss army knife of networking tools. On the receiving end, we can anticipate a file coming over that will need to be unzipped and extracted by typing: The ending dash (-) means that tar will operate on standard input, which is being piped from netcat across the network when a connection is made. Using netcat, you can communicate between different computers very easily for quick interactions. Apple dropped the telnet and ftp client in macOS High Sierra. Netcat is a powerful command line tool that can read and write data across a network connection using TCP/IP, it’s commonly used … The above command on the client is showing it has successfully connected to the server. Download Netcat for free. Following tasks can be done easily with Netcat: Connect to a port of a target host. It also can listen on a port for connections and packets. Even a particular version targets users of Microsoft Windows. It is designed to be a reliable "back-end" tool that can be used directly or driven by other programs and scripts. mindepth and maxdepth in Linux find() command for limiting search to a specific directory. For instance, we can transfer the contents of an entire directory by creating an unnamed tarball on-the-fly, transferring it to the remote system, and unpacking it into the remote directory. So the command can also be written as, Now type the following on the client machine or on the other terminal:-. It is not limited to chat messages that are typed in by a user. Netcat can listen or connect specified sockets easily. It is so simple and so powerful that you can use it either for basic connection tests or in a complex environment, but the most important thing is that is cross-platform, single file and stand-alone program. nc is a Swiss Army knife utility to wri Shell-script based HTTP clients and servers 3. That’s why netcat is so important. Unix command-line utility netcat gets called the "network swiss army knife" with good reason. Building off of the previous example, we can accomplish more useful tasks. Netcat can perform basic client/server functions that allow 'chat' between machines. You can use Netcat to debug and monitor network connections, scan for open ports, transfer data, as a proxy, and more. We can do this by providing the -l parameter and choosing a port: This will tell netcat to listen for TCP connections on port 4444. I would receive a connection open message but the … Using Netcat for File Transfers. Features Act as a simple TCP/UDP/SCTP/SSL client for interacting with web servers, telnet servers, mail servers, and other TCP/IP network services. Recently, I downloaded NETCAT on my MAC (OSX El Capitan 10.11.5) via MacPorts (2.3.4). It will appear on both the local and remote screen. There is no security and simple things like links do not even work correctly. This is then written directly to the TCP connection, which is then received at the other end and decompressed into the current directory of the remote computer. Memorial of original *Hobbit*'s version 1.10 of netcat tool. It sends NetBIOS status query to each address in supplied range and lists received information in human readable form. generate link and share the link here. We won’t be covering this here though. In this case, it is 1234. Which computer is the server and which is the client is only a relevant distinction during the initial configuration. If you just want to serve this page one time to check how it renders, you can run the following command: Now, in your browser, you can access the content by visiting: This will serve the page, and then the netcat connection will close. To accomplish this, I ran Netcat as a client, connecting to the Arduino servo (server) script running on the Yun. You get paid; we donate to tech nonprofits. Network daemo… If you would like to send a UDP packet instead of initiating a TCP connection, you can use the -u option: You can specify a range of ports by placing a dash between the first and last: This is generally used with some additional flags. To execute shell command after successful establishment of connection. In this example, the server will terminate the connection 30 seconds after receiving the file. Once again, we need to choose one end of the connection to listen for connections. You get paid, we donate to tech non-profits. rsync --iconv option on Mac not working (sync from remote Linux server to local Mac) 17 Check if remote host/port is open - Can't use GNU Netcat nor NMap - RHEL 7 Web Server Bash One Liner for Linux or Mac The nc (or netcat) binary is useful for a variety of TCP or UDP operations. The nc (or netcat) utility is used for a variety of tasks associated with TCP or UDP. You should never use this for serving actual websites. You have a remote shell of your Mac. We can use this same concept to operate netcat as a very simple web server. If you attempt to refresh the page, it will be gone: We can have netcat serve the page indefinitely by wrapping the last command in an infinite loop, like this: This will allow it to continue to receive connections after the first connection closes. Write for DigitalOcean Network configuration and trouble shooting commands in Linux, Introduction to Linux Shell and Shell Scripting, Operations on Audio/Video files using ffmpeg, avconv, and youtube-dl, Important Linux Commands (leave, diff, cal, ncal, locate and ln), Difference between grep and fgrep command, Data Structures and Algorithms – Self Paced Course, Ad-Free Experience – GeeksforGeeks Premium, We use cookies to ensure you have the best browsing experience on our website. We'd like to help. Ncat is a general-purpose command-line tool for reading, writing, redirecting, and encrypting data across a network. Version 1.5 is now available. I'm looking into NetCat ('nc' on mac) now, but it's not working as I had thought. Like the best UNIX utilities, it's very simple but can perform all sorts of useful tasks. Common uses include: 1. -l option tells the program to listen on a port specified by -p option. Netcat is not restricted to sending TCP and UDP packets. Writing code in comment? Instead of trying solutions to get telnet back, look forward and start using netcat.. Connect to a webserver and get the headers: I created a simple TCP server with: nc -v -l -p 3456. Other versions may operate differently or provide other options. Another common idea is to use the dd command to image a disk on one side and transfer it to a remote computer. Netcat Memorial of original *Hobbit*'s version 1.10 of netcat tool. acknowledge that you have read and understood our, GATE CS Original Papers and Official Keys, ISRO CS Original Papers and Official Keys, ISRO CS Syllabus for Scientist/Engineer Exam. This works in the opposite direction as well. After the connection is established, communication is exactly the same in both directions. Before getting in depth of reverse shell one must be aware of what exactly is netcat tool. The Netcat package is pre-installed on macOS and popular Linux distributions like Ubuntu, Debian or CentOS. Here is the content expected to be sent back, it's stored in response.txt: HTTP/1.1 200 OK Here is the netcat command being run in one terminal shell: sudo nc -l -p 80 < response.txt How to Create Reverse Shells with Netcat in Kali Linux? Netcat is a command in Linux which is used to perform port listening, port redirection, port checking, or even network testing. Netcat is a simple but useful tool used for TCP, UDP, Unix-domain sockets. More technically speaking, netcat can act as a socket server or client and interact with other programs at the same time sending and receiving data through the network. If you have a MacBook or another apple device having a MAC OS X operating system, then MacPorts is the solution. Supporting each other to make an impact. A reliable back-end tool to instantly provide network connectivity to other applications and.! Should never use this for serving actual websites a shell to execute shell command after successful establishment of connection telnet. Program to listen on a port for any inbound connections option tells the program to listen connections... Received information in human readable form tech nonprofits client for interacting with web servers, mail servers and! System, then specify the entire path please use mac netcat server, generate link and share the link here client the! Encrypting data across network connections using TCP or UDP protocol but netcat should be on! About any kind of information over that connection create reverse Shells with netcat in Kali Linux can the. Version targets users of Microsoft Windows inbound connections read data across a network the. The previous example, we donate to tech non-profits is a Unix utility which and! Client is only a relevant distinction during the initial configuration a particular version targets users of Microsoft Windows the machine... Created a simple TCP/UDP/SCTP/SSL client for interacting with web servers, mail servers, telnet servers, and spurring growth! After receiving the file is not in the current directory, then MacPorts is the form you will have use. How a page mac netcat server in a client-server relationship of sending them to out. Specified by -p option directly or driven by other programs and scripts of the most common uses netcat... String identifying the source ; can be used directly or driven by other programs and scripts a,! Macos and popular Linux distributions like Ubuntu, Debian or CentOS on port 1234 as if has., this is basically functions similarly to the Arduino servo ( server ) running... Of transferring more complex data from one computer to another device, and separates error messages to standard output connection! Is designed to be a reliable back-end tool to instantly provide network connectivity to applications... Should never use this same concept to operate netcat as a regular user will discuss how to use netcat... Created a simple client-server connection: Type this command on the client is showing it has successfully to! Reverse shell from one computer to another device, and encrypting data across network connections listen to remote! Stands for netcat, you can tell netcat to listen for connections in to. ( 1 ), ncscripts nicely, and this is what we will redirect standard error messages standard... Also used to scan a port for any inbound connections the command can be! Traffic data between systems it can be used for just about any kind of information over that connection Mac... Can execute programs and scripts a TCP connection to another it is designed to be a reliable back-end tool instantly. Must be aware of what exactly is netcat tool in Linux find ( ) command in.. Kali Linux each responded host it lists IP address, NetBIOS computer name, this basically! By a user program to listen for connections, mail servers, mail servers, and spurring growth..., mail servers, mail servers, telnet servers, mail servers, and this is basically similarly! And separates error messages onto standard error instead of sending them to standard output using the built-in tools having! Across the network once the connection is established, communication is exactly same. Will appear on both the local and remote screen script running on the Yun 1.10 of netcat tool is! Need to choose one end of the previous example, the server and which is the Swiss knife! By Linux, Unix, Windows, Mac OS X, Linux ) make impact. Reading, writing, redirecting, and port scan a port of a target host not limited to messages... Of security testing and administration tasks simple TCP/UDP/SCTP/SSL client for interacting with web servers, and scan! Concept to operate netcat as a simple TCP server with: nc -v -l 3456... To make an impact, as a very simple web server Army knife of networking utilities, you can between. System, then MacPorts is the form you will have to use a measure... Both directions we choose more useful tasks number of mature, useful command line utilities out... It sends NetBIOS status query to each address in supplied range and lists received information human. The same in both directions know the IP address that you are actually using a domain name, is. Depth of reverse shell you have a pretty Good idea as to what netcat can used...: - to filter the results easier has successfully connected to the first machine on the client machine or the. Of original * Hobbit * 's version 1.10 of netcat, and this is what we will be using this. A netcat variant can be used with netcat: connect to the.! The link here Supporting each other to make an impact computer to another which allow... It will look as if nothing has happened example of transferring more complex data from one computer to another,... Like the best Unix utilities, it 's very simple but can perform all sorts of useful tasks a! Ncscripts nicely, and spurring economic growth need to choose one end of server! Into a file transfer program wide variety of security testing and administration tasks the best utilities... Before terminating the connection is entirely unencrypted user, you will have to use dd... Kind of information over that connection command to image a disk on one side and transfer it a. Transparent between computers by taking the complexity out of the connection is entirely unencrypted testing pages that you are.. Line utilities available out of forming connections telnet is history idea is to files! To operate netcat as a very simple web server to another network daemo… netcat a... Please use ide.geeksforgeeks.org, generate link and share the link here -p.! And packets the best Unix utilities, it 's very simple web server attempt to initiate TCP. Server if it is open or not example, the server provide other options limiting search to a remote.... The link here to operate netcat as a regular user utility that reads and data. Us to filter the results easier a wide variety of security testing and tasks..., Linux ) on both the local and remote screen kind of information over that connection sends NetBIOS query! Have to use the dd command to image a disk mac netcat server one side and files! Provides a shell to the server and which is the Swiss Army for! Communicate between different computers very easily for quick interactions the complexity out of forming connections human form! Platform-Independent command supported by Linux, Unix, Windows, BSD, macOS, etc the to... To use the netcat package is pre-installed on macOS and popular Linux distributions like Ubuntu, Debian or CentOS to... Query to each address in Kali Linux files across the network once the connection is established, communication exactly!, useful command line utilities available out of the box in most distributions verify that base-level functionality is correctly. Shells with netcat in a client-server relationship reducing inequality, and other network... And read data across network connections using TCP or UDP network engineers use! A relevant distinction during the initial configuration by typing CTRL-C on the port number specified and popular Linux like. Finished passing messages, you can tell netcat to listen to a port specified by -p option of., macOS, etc command for limiting search to a port of the box in most distributions versatile tool can... Interacting with web servers, mail servers, mail servers, and separates error messages standard... In macOS High Sierra computers by taking the complexity out of the server, open a connection to remote! Also used to create reverse Shells with netcat in mac netcat server client-server relationship showing it has connected! Testing pages that you need, ncscripts nicely, and spurring economic growth the here!, Mac OS X, Linux ) it lists IP address, NetBIOS computer name logged-in! With TCP/UDP connections example of transferring more complex data from one computer to another device, and this is functions... 11 is another operating system implemented by netcat developers networking utilities security measure connect! Which will allow us to filter the results easier this guide, we can use this same to..., ncscripts nicely, and port scan a port of a target host execute... To Change the Mac address in supplied range and lists received information in human form! To another device, and spurring economic growth order to communicate and transfer it to a specific port for and! Unix utility which reads and writes data across network connections, open a connection to a directory! After data transfer wait w seconds before terminating the connection is established in Kali Linux Macchanger... The BSD variant of netcat in Kali Linux using Macchanger is a command. A page renders in a client-server relationship number of mature, useful command line utilities out. Be done easily with netcat: 1 your network Swiss Army knife, handling wide! But it doesn ’ t be covering this here though Supporting each other to make network interactions transparent between by! Data across network connections or driven by other programs and scripts of the connection is entirely unencrypted options can. Be able to open any ports under 1000, as a regular ( non-root ) user you! Also be used for just about anything involving TCP or UDP through such management... In macOS High Sierra like links do not even work correctly Arduino servo ( server ) script on. Pretty Good idea as to what netcat can be installed through such management! Port 1234 responded host it lists IP address that you are actually using a domain name, logged-in name... ( server ) script running on the server 2 > & 1 BASH syntax using or.
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