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Bash check if port is open

Simplest way in bash. Test if your port is open. (echo >/dev/tcp/localhost/8080) &>/dev/null && echo TCP port 8080 open || echo TCP port 8080 not open Replace the port with what you are testing. Or you can use nc. nc -vz 127.0.0.1 8080 Returns: Connection to 127.0.0.1 8080 port [tcp/*] succeeded. Share . Improve this answer. Follow edited May 26 '20 at 13:33. answered Aug 22 '14 at 1:09. R. From a bash script how can I quickly find out whether a port 445 is open/listening on a server. I have tried a couple of options, but I want something quick: 1. lsof -i :445 (Takes seconds) 2. netstat -an |grep 445 |grep LISTEN (Takes seconds) 3. telnet (it doesn't return) 4. nmap, netcat are not available on the serve As an alternate method, we can use bash provided / dev/tcp/ to test if a port is open on a remote system. /dev/tcp/host/port. If host is a valid hostname or Internet address, and port is an integer port number. or service name, bash attempts to open a TCP connection to the corresponding socket. The format for this test is as follows: $ cat < /dev/tcp/<hostname_or_ip> /<port_number> Bash - How to check whether a particular port is open on a machine from a shell script and perform action based on that. bash shell-script. I am running my below shell script on a machine on which c++ application server is running on port 8080 and in the shell script I am executing an URL and stores the response coming from that URL in DATA variable. But suppose if the same app server is.

Check Open Ports using Bash Pseudo Device # Another way to check whether a certain port is open or closed is by using the Bash shell /dev/tcp/.. or /dev/udp/.. pseudo-device. When executing a command on a /dev/$PROTOCOL/$HOST/$IP pseudo-device, Bash will open a TCP or UDP connection to the specified host on the specified port Checking for open ports is among the first steps to secure your device. Listening services may be the entrance for attackers who may exploit services vulnerabilities to gain access or disrupt a system. A listening service or listening port is an open port with an application waiting for a client to connect (e.g an FTP server waiting for an FTP client) There is not sense to keep a web server running if you aren't serving a website, nor to keep the port 22 open if you don't use ssh. This. How to check if port is in use in. To check the listening ports and applications on Linux: Open a terminal application i.e. shell prompt. Run any one of the following command on Linux to see open ports: sudo lsof -i -P -n | grep LISTEN sudo netstat -tulpn | grep LISTEN sudo ss -tulpn | grep LISTEN sudo lsof -i:22 ## see a specific port such as 22 #

Ping is using ICMP protcol. The ping command can not be used to ping a specific port. However, use any one of the following command to see if a port is open or not as follows: Linux ping port using telnet comman Let's assume you are running a web server on ports 80 and 110 and the same ports, 80 and 110, are also open on your firewall, everyone will be able to access said ports unless you explicitly ban specific IP addresses through your firewall. If such cases arise, scan for open ports. There are multiple ways of checking or scanning open ports We can use bash utility with timeout to test SSH connection by checking port 22 status. If you are using a different port for 22 then you can replace it in the below syntax. Syntax: # timeout <value> bash -c </dev/tcp/ <server> / <port> Here server2 is my target host, I will execute the command with a timeout value of 5s on port 2

bash - How to check whether a particular port is open on a

Check Listening Ports with lsof # lsof is a powerful command-line utility that provides information about files opened by processes. In Linux, everything is a file. You can think of a socket as a file that writes to the network. To get a list of all listening TCP ports with lsof type: sudo lsof -nP -iTCP -sTCP:LISTEN. The options used are as follows However, if a UDP packet is sent to a port that is not open, the system will respond with an ICMP port unreachable message. Most UDP port scanners use this scanning method, and use the absence of a response to infer that a port is open. However, if a port is blocked by a firewall, this method will falsely report that the port is open To check that the port is open from a remote computer, an administrator can run the telnet command from a remote computer against the IP address of the Windows computer. For example, to check if port 22 is open, I will run the telnet command from a remote computer as follows: telnet IP_ADDRESS 2 2) Check open ports using netstat command The netstat command is a powerful command tool that is used for checking open TCP and UDP ports alongside other attributes. To check open ports, issue the command In this method we will use nmap to detect the open port on your system. We can use the following command to show tcp port connections: We can use the following command to show tcp port connections: nmap -sT -O localhos

To check your system for open ports, execute the following command in your terminal: $ sudo lsof -i. In the output of this command, the ports listed in the LISTEN state are the ones that are in use, as shown in the image below: Method 2: Using the ss Command. The ss command can be used to determine any open TCP and UDP ports in your system in the following manner: To query both the TCP. Actually there is a better way to see what ports you have open. The issue with netstat or lsof is that they query network stack and actually do not connect to the machine but instead trying to see what is running on the system. The better approach is to use nmap like so: nmap -sT -O localhost To see open ports Checking Open Ports in Linux. Network ports are usually allocated just after the IP address. Let your network address followed by a 16-bit socket, then the total number of available ports will be 2^16= 65536. In computer networking, we all are familiar with the concept and types of networking addresses like physical address and local address. Every networking address has an endpoint that. In this article I will share examples to check port status and open a port in Linux. This article was written while using CentOS 8, so it is safe to say that it also fully covers CentOS/RHEL 7/8, Fedora, Oracle Enterprise Linux and generally the whole Red Hat family of operating systems and possibly Novell's SLES and OpenSUSE # nc -zvw3 192.168.1.95 22 nc: connect to 192.168.1.95 port 22 (tcp) failed: Connection refused 2) Check open ports using nmap command. nmap (Network Mapper) is a powerful open source network scanning tool that is designed to rapidly scan large networks, but can also be used to scan a single host.. It is specifically used for security auditing and penetration testing, but it can also be used.

bash - Efficiently test if a port is open on Linux

When it comes to checking if a network port is opened or closed on a remote computer, there's no easier way than to use Telnet. Ports that are left open for no reason are a security risk that can be exploited by malicious programs and viruses. At the same time, if a legitimate software communicates through a certain port, having that port closed will make the program throw errors and. Quickest way to test if a TCP port is open (including any hardware firewalls you may have), is to type, from a remote computer (e.g. your desktop): telnet myserver.com 80 Which will try to open a connection to port 80 on that server. If you get a time out or deny, the port is not open :) Share . Improve this answer. Follow answered Sep 7 '11 at 17:33. Adrian Macneil Adrian Macneil. 1,576 2 2. Connection to 192.168.1.7 22 port [tcp/ssh] succeeded! How to check whether multiple ports are open on multiple remote Linux server? Use the following script if you want to check the multiple ports in multiple servers. In my case, we are going to check whether the port 22 and 80 is open or not in the given servers. Make sure you have to replace. 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

Using Bash to test if a TCP port on a remote system is ope

You can use nmap to check port is open or not with below command: nmap -p80 127.0.0.1. If you want to use in script : #!/bin/bash echo — nmap -p80 192.168..1 | grep open if [ $? -eg 0 ] then echo {ip} has the port 80 open else #do nothing fi echo —-exit To show which processes are listening on port 8080: lsof -Pi :8080 -sTCP:LISTEN. In your case, you want to test whether a process is listening on 8080 - the return value of this command tells you just that. It also prints the pid of the process. lsof -Pi :8080 -sTCP:LISTEN -t. If you need just the test, with no output, redirect it to /dev/null check if port is open using /dev/tcp in BASH. GitHub Gist: instantly share code, notes, and snippets Common Syntax for nc (netcat): $ nc [-options] [host_name or ip] [port_number] In this example, we will check whether port 22 is open or not on the remote Linux system. If it's a success then you will be getting the following output: # nc -zvw3 192.168.1.8 22 Connection to 192.168.1.8 22 port [tcp/ssh] succeeded

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Bash - How to check whether a particular port is open on a

To check your system for open ports, execute the following command in your terminal: $ sudo lsof -i In the output of this command, the ports listed in the LISTEN state are the ones that are in use, as shown in the image below Use netcat as above, on the server, and from a client use netcat to attempt to the connect to the port you opened. nc [-u] a.b.c.d NN will connect to port NN on a.b.c.d, using UDP if the -u flag is specified. You can then type input into the client end, and it should show up on the server This shell script enables you to perform a ping to a remote host and check whether the mentioned port is opened on that server. This helps system admin for ping test and also make sure if there any issues with specific ports The next command will check if ports 80, 22 and 21 are open on the remote host 192.168.5.10 (we can use the hostname as well): nc -zv 192.168.56.10 80 22 21. It is also possible to specify a range of ports to be scanned:'. $ nc -zv 192.168.56.10 20-80 Add the -p option to see the processes (if any, some ports may be bound by the kernel like for NFS) which are listening (if you don't have superuser privileges, that will only give that information for processes running in your name). That would list the ports where an application is listening on (for UDP, that has a socket bound to it)

How to Check (Scan) for Open Ports in Linux Linuxiz

Is the port status LISTENING indicated that the port is opened? Yes. It means that some service is listening to that port on your computer for incoming connection i.e. this port is open for establishing new connections. Any port that are not shown in the output indicated that it's closed? Yes To talk to specific service on your server computer, let's say the HTTP server, the client computer has to pass the port 80 along with the IP address 10.0.1.11. So port 80 is an open port because a client computer can talk to it. When you have firewall program configured, by default, it blocks all the port I would like to see what ports are open on my machine, e.g. what ports my machine is listening on. E.g. port 80 if I have installed a web server, and so on. Is there any command for this How to Scan Nmap Ports. To scan Nmap ports on a remote system, enter the following in the terminal:. sudo nmap 192.168..1. Replace the IP address with the IP address of the system you're testing. This is the basic format for Nmap, and it will return information about the ports on that system.. In addition to scanning by IP address, you can also use the following commands to specify a target

Quickest way to test if a TCP port is open (including any hardware firewalls you may have), is to type, from a remote computer (e.g. your desktop): telnet myserver.com 80 Which will try to open a connection to port 80 on that server. If you get a time out or deny, the port is not open : Checking Open Ports in Linux Network ports are usually allocated just after the IP address. Let your network address followed by a 16-bit socket, then the total number of available ports will be 2^16= 65536 Using netstat to list open ports Type the following netstat command sudo netstat -tulpn | grep LISTEN For example, TCP port 631 opened by cupsd process and cupsd only listing on the loopback address (127.0.0.1). Similarly, TCP port 22 opened by sshd process and sshd listing on all IP address for ssh connections We had recently written an article to check whether the port is open on the remote Linux server. It will help you to check for single server.If you want to check for multiple servers then you can use any of the one following command such as. nc (netcat) nmap and; telnet. If you would like to check for 50+ servers then what will be the solution

If you can see the SSH version information as highlighted above, the SSH port is open and SSH server is functioning properly. If port 22 is open but SSH server is not listening on it, you'll get an error like this The final tool we will cover for querying open ports is lsof command, which is used to list open files in Linux. Since everything is a file in Unix/Linux, an open file may be a stream or a network file. To list all Internet and network files, use the -i option. Note that this command shows a mix of service names and numeric ports As you can see below, ports 443 and 80 are open I could also check If ports are open on my Windows Container using: Docker port win02 3389/tcp In this case, port 3389 Is close Do you see one port which isn't opened in the output of the netstat I gave here? - dan May 19 '20 at 20:50 netstat output is going to vary significantly. For example, I ran your version right now and it does show all of the listen ports, but also around 100 ESTABLISHED connections Test Connection to Port using PowerShell. Use one of the following PowerShell commands to check if TCP port on a remote host is opened: PS C:\> tnc www.shellhacks.com-p 443 - or - PS C:\> New-Object System.Net.Sockets.TcpClient(www.shellhacks.com, 443) Check open ports on multiple host

You can open the service file /etc/services with the following command: $ less / etc / services. The contents of the /etc/services file: The /etc/services file contains a long list of service name, and the port number and protocol of that specific service that a client or server may use Hi, I need to create a script which checks the availability of a particular service on a particular Port on HP-Unix. Is there any command in unix wherein we can check if any port is accepting the connections now. Thanks, Vihang We have a requirment where in we have to test 500+ Port opening rules. So requires a suggest on below points. Which is the best tool to test the connectivity of the ports. Telnet will be sufficient; If there is no application is listening to a port will telnet be getting a resposne from the port. We are checking it in Amazon VPC against.

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port-check.sh - small script to check if TCP ports are opened through firewalls etc. - port-check.sh. Skip to content. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. stojg / port-check.sh. Created May 2, 2015. Star 1 Fork 7 Star Code Revisions 1 Stars 1 Forks 7. Embed. What would you like to do? Embed Embed this gist in your. LINUX,TELNET,PORT,NC,NMAP.As a system administrator or network engineer or application developer, there is a need to check whether a port on remote server is open so that you can tell whether the service under check is runningPixelstech, this page is to provide vistors information of the most updated technology information around the world 5) How to Check if a Particular Port is Open in Linux or Not. If you want to check if a particular port is open on Linux or not, use the command below. # netstat -tplan | grep :80 or # ss -lntu | grep :80 tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 16634/http how to check for open ports or sockets in linux. Posted on January 25, 2013 July 6, 2019 by barkeep. The Linux operating system as well as many of the Linux applications use ports to communicate with each other. A port can be viewed as a communication endpoint that is identified by a number called the port number. This port number along with the address of the machine is used by other. An application (such as tomcat) opens a port; once you stop that application, the port is closed. To open it again, you must (re)start an application that opens that port. You might sudo service tomcat7 start, for example

So the process with ID 1399 (sshd) is listening on port 22! The second test passed! Third, you can use the lsof command to check if the port 22 TCP file is open: [root@server ~]# lsof -i COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 1399 root 3u IPv4 1235481137 0t0 TCP *:ssh (LISTEN) httpd 6126 root 3u IPv4 1309891499 0t0 TCP *:http (LISTEN) [root@server ~]# So sshd (SSH daemon) and. You can find that a server has an open port on 80 or 8080 but still not be able to connect it. For instance, I have about three dozen polycom phones that are accessible at port 8080 but they have bum config files. When someone tries to access them at that port they aren't able to connect. And it may depend on how you're trying to connect A port. Think of a port as a running application. Why would you check for a port up on a host ? To know if the application is up and running. To know if the connection is open between local and remote host. How do you check for open ports ? Normally as input you would need: host and port. Output you would get: Connection successful. Checking.

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You should see the rules have been updated and the port is now blocked. If you find blocking this port to cause problems with a service or application, you can re-open it with the command Use the script bellow to check if the port is open. Replace IP_Address_Server with the address of the server you are interested in. Replace port with the port to check (for example: 17777). Save this script in a text file as porttest.ps1 and run in PowerShell.-- Scripts are not supported under any SolarWinds support program or service. -- Scripts are provided AS IS without warranty of any kind. A free open port check tool used to detect open ports on your connection. Test if port forwarding is correctly setup or if your port is being blocked by your firewall or ISP

If the first test fails, your port is completly closed and you have to work on your mysql conf again. If the first succeeds and the second one fails, recheck that mysql really listens to 3306. Do a . sudo netstat -tlpn Check that 0.0.0.0 is the source ip for port 3306/tcp. If that is the case you will have to recheck the settings with ufw. Disable the ufw for testing, to see if it makes a. 5. If you need to check expiry date, thanks to this blog post, found a way to find this information with other relevant information with a single call: echo | openssl s_client -servername unix.stackexchange.com -connect unix.stackexchange.com:443 2>/dev/null | openssl x509 -noout -issuer -subject -dates Then I open the bash, get nginx & ssh work! But can't see any port in bash. I reinstall KB4016871, it still work. 1 sunjoong mentioned this issue May 17, 2017. UPnP-IGD using the miniupnpc python package doesn't work. #2119. Closed Copy link zhlicen commented May 23, 2017. @wilon Still not working in my 15063, what's your os build? sunjoong mentioned this issue May 26, 2017. port opend in.

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How to check for open ports on Linux - Linux Hin

  1. On my windows dev box mysql is running on port 3306 How can I check what port it is running on the unix server that I have to upload the app to. Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers
  2. I just had this quick idea to write a tcp port scanner in bash. Bash supports a special /dev/tcp/host/port file that you can read/write. Writing to this special file makes bash open a tcp connection to `host:port`. If writing to the port succeeds, the port is open, else the port is closed. At first I wrote this quick..
  3. For opening a UDP port, type the following command: ★ iptables -A INPUT -p udp -sport portno -j ACCEPT where portno needs to be replaced with the numerical port number that you want to open. Here, we have assumed that you have logged in as the root user and have the superuser access. This should clear your concepts on how to open a port in Linux
  4. Tuning your bash or zsh shell on Fedora Workstation and Silverblue; Red Hat announces RHEL 8.1 with predictable release cadence ; More on LinuxToday. Sitemap; Feedback; 3 Ways to Check if a Port Is Open on a Remote Linux System Apr 19, 2021, 17:00 (0 Talkback[s]) (Other stories by Magesh) In this article, we will show you how to check if a network port is opened or closed on a remote Linux.
  5. Test TCP Ports What is TCP TCP stands for Transmission Control Protocol. Using this method, the system sending the data connects directly to the computer it is sending the data it to, and stays connected for the duration of the transfer

If you're connected directly to the internet (ie you don't have a router/wifi access point/etc) between your computer and your cable modem, then the following will be sufficient to tell you if you have something listening on that port: [code]telne.. Check UDP port open in nmap. One of the most popular ways to check UDP port open or not is nmap. #nmap -sU -p port target. This command is used to scan the UDP port. Ports to be scanned need to be specified where -sU activates UDP port scan. For e.g. #nmap -sU -p 1-1023 192.168.1.1. In this example, the port range is from 1 to 1023 at the node 192.168.1.1. Also, instead of scanning the.

How to check if port is in use on Linux or Unix - nixCraf

How to ping and test for a specific port from Linux or

Open ports in any system are meant to accept network packets that can compromise the security of the computer to a great extent. For security issues, ports that are unused are generally closed by a firewall. For users with systems based on the Windows or Linux platforms, it is possible to find out which ports are open Check if the port is being used or not (testing port 3000 in this example):bash$ netstat -na | grep 3000; If the port is in use, then most likely it will be the software firewall blocking you. You can check by running:bash$ sudo /sbin/iptables -L; Check for the port. If it isn't listed, you will need to add it:bash$ sudo vi /etc/sysconfig. function check_net_port {local ip=$1 local port=$2 exec 3> /dev/tcp/$ip/$port if [ $? -eq 0 ]; then return 0; else return 1; fi Before opening a port on Linux, let us first check the list of all open ports, and choose an ephemeral port to open from that list. We can use the netstat command to list all open ports, including those of TCP, UDP, which are the most common protocols for packet transmission in the network layer. NOTE: If your distribution doesn't have netstat, it is not a problem. You can use the ss command.

That means that histories are often lost if you have more than a single Bash session open (either locally or over SSH). Another common can be used to do everything from checking to make sure your for loop will run the expected sequence to allowing you to check if remote ports are open. The syntax is very simple to check for an open port: echo > /dev/<udp or tcp>/<server ip>/<port>. For. You've opened a UDP port on your server but not sure how to check if you can reach it from the outside. When testing TCP ports, you can check with tools like nmap or nc only from the outside, but the nature of UDP is that it doesn't send anything back so you need to monitor the port on the receiving server to see if you receive any packets from the remote server

Using Netstat to check which ports are listening in Linux. Netstat is a command line utility for Linux that prints network connections, routing tables, interface statistics, masquerade connections, and multicast memberships. Netstat can be used to diagnose network issues and service problems. NOTE: Netstat has recently been deprecated in favor of ss and ip route, now part of the net-tools. Use sudo ufw allow [port number] to open a port. For example, if you want to open the SSH port (22), you'd type kbd and press ↵ Enter to open the port. There's no need to restart the firewall, as the change will take effect immediately. If the port you're opening is for a service listed in /etc/services, you just type the service's name instead of the port number <> implies that the socket is open for both reading and writing. Depending on your need, you can open a socket for read-only (<) or write-onlyTCP). The protocol field can be either TCP or UDP. The host and port fields are self-explanatory. For example, to open a bi-directional TCP socket for a domain with HTTP port and file descriptor 3

Guide to Check for Open Ports in Linux - Blackdow

Unfortunately telnet will only allow to test ports for TCP. On the contrary nc can test ports for both TCP and UDP. TCP [code]# nc -z -v -u [hostname/IP address] [port number] # nc -z -v 192.168.10.12 22 Connection to 192.118.20.95 22 port [tcp/ss.. $ sudo systemctl status snmpd. We can also use netstat command in order to check whether the new SNMP port is opened like below.-ul simply means list listening UDP ports. $ netstat -ul. Scan SNMP Ports with Nmap. nmap is a powerful tool that is used to scan networks. We can use nmap in order to identify SNMP services on the given network or hosts I run sshd service on non-standart port, and replace 22 port with my settings. After thant when I run this script I got blank value. After thant when I run this script I got blank value. Running services status @ server.****.com [ Thu Jun 18 19:07:24 EEST 2009 Always, Java developers need to know which application is using the high demand 8080 port. In this tutorial, we will show you two ways to find out which application is using port 8080 on Linux. 1. lsof + ps command. 1.1 Bring up the terminal, type lsof -i :808 I was able to see which app had an open port using standard linux knowledge. Install terminal emulator or do an adb shell and execute the following: shell@android:/ $ cat /proc/net/tcp sl local_address rem_address st tx_queue rx_queue tr tm->when retrnsmt uid timeout inode 0: 0100007F:1C23 00000000:0000 0A 00000000:00000000 00:00000000 00000000 1001 0 2111 1 e22cc000 300 0 0 2 -1 The important.

5 simple methods to test ssh connection in Linux & Unix

netstat is very useful tool which provides a lot of information about the network of operating system.netstat command can list ip addreass, route, port, connections etc.More detailed information about the netstat command can be found in the following tutorial.. Linux Netstat Command With Examples. List All Listening Ports. We can use netstat -l options in order to list all listening ports It's a mighty tool that, together with pipelines, makes the shell powerful. The redirection operators are checked whenever a simple command is about to be executed. Under normal circumstances, there are 3 files open, accessible by the file descriptors 0, 1 and 2, all connected to your terminal Ubuntu Firewall (UFW) - How to Configure, Check Status, Open/Close Ports & Enable/Disable Firewalls are one of the most important (if not the most important) features to install and configure correctly - Lets learn how to do it! Last Updated: December 2nd, 2019 by Hitesh J in Guides, Linux. UFW stands for Uncomplicated Firewall is the default firewall tool for Debian based operating.

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SLES 12. Open the YaST tool by issuing the following command: yast Click Security and Users > Firewall.; Select the Allowed Services tab and click Advanced....; Enter the desired port range in the from-port-start:to-port-end format and specify the protocol (TCP or UDP). For example, enter 60000:60010 to open ports 60000 to 60010.; Click OK to close the Advanced dialog box During the port scan stage if this port is found open then it is likely a PostgreSQL installation to run on the host. nmap -sV 192.168.100.11 -p 5432 PostgreSQL — Version Identification via Nma With a little help from Bash, you can fully automate this process. Assume the client and the server hostnames are client and server, and that the server listens for SSL/TLS connections on port 443. To check which protocols server accepts, you could use the following parameters: -ssl2, -ssl3, -tls1, -no_ssl2, -no_ssl3, or -no_tls1 #!/bin/bash ##### # This script is to test ip addresses in a range# (a) Checks Ping Response# (b) Checks for DNS Entries (Reverse Lookup) # (c) checks for SSH Connection - Tests Port 22 is open# (d) Checks for RDP Connection - Tests Port 3389 is open# ##### # Setting Enviroment VariablesMINPARAMS=4SEARCHIPRANGE=$1STARTINGIPADDRESS=$2ENDINGIPADDRESS=$3NSLOOKUPSERVER=$4USERID=$5LSSHPORT. I added some ports to a service group that was currently opened on our network. The ones I added will not open. I contacted Sonicwall and had them remote in and determine that everything is okay by their standard. The tech rep over at Sonicwall is telling me that the firewall is fine and to check something else. I also called our technology.

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Using the command line to check if port is open

5 ways to check if a Port is open on a remote Linux PC

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linux - Test if a port on a remote system is reachable

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Test from shell script if remote TCP port is open (11) . I'm looking for a quick and simple method for properly testing if a given TCP port is open on a remote server, from inside a Shell script However, if you only want to see a specific service name or port, you can use the netstat command with the option above with grep Example below shows you to scan for open ports and only list port 22.. sudo netstat -tnlp | grep :22. You should see similar line as below: tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 25538/sshd tcp6 0 0 :::22 :::* LISTEN 25538/sshd. The command above using grep shows. For our example, we will create a script that checks the stats for any service like mysql, apache etc. #!/bin/bash # Nagios Plugin Bash Script - check_service.sh # This script checks if program is running # Check for missing parameters if [[ -z $1 ]] then echo Missing parameters I'm looking for a bash script that will test if a set of ports are open from a given machine. Currently I do this manually by telneting to the port, but I can't figure out how to loop this in a script while checking success/failure It doesn't matter which port is used, as long as it's greater than 1023 (remember, only root can open sockets on privileged ports) and doesn't conflict with any ports already in use. The connection is forwarded to port 6667 on the remote server, since that's the standard port for IRC services. The -f option backgrounds ssh and the remote command sleep 10 is specified to allow an.

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