Hello guys, If you have worked as a software developer or Java programmer then you know that SQL, Linux, and Networking fundamentals are essential skills for any Java developer, especially for server-side Java programmers. It actually doesn't matter whether you are applying for the job as a Java developer or C++ developer, Python developer or Ruby programmer, SQL and UNIX always have some role to play in your career. It's even essential for people who have less to do with programming like application support guys, business analysts, project managers, and subject matter experts. Hence, it's imperative for any programmer or IT professional to prepare both SQL and UNIX well before going for any job interview.
Top 6 Udemy Courses to Learn Linux and UNIX in 2025 - Best of Lot [UPDATED]
Hello guys, if you want to learn Linux operating systems and command lines and look for the best Linux courses, you have chosen the right place. In the past, I have shared some free Linux courses and bash scripting courses for programmers and developers, and many of you asked for more comprehensive online Linux courses to learn Linux in-depth, which motivates me to write this article. In this article, you will find the best Linux online training classes, online paths, and tutorials from Udemy, Pluralsight, Coursera, and edX, my favorite online learning platforms.
Top 5 Free Udemy Courses to Learn Bash and Shell Scripting in Linux in 2025 - Best of Lot
Hello guys, the importance of Linux is well known but many programmers don't know how to write shell scripts to make most of it. Some of them even not familiar with various Linux shells like bash, csh, or ksh, which further limits their ability. If you don't know, bash is a UNIX shell and command language, which is also a default login shell for many Linux systems and Mac OS. It provides the ability to write scripts to do things programmatically. Shell scripting is an important skill to become an efficient developer or programmer. It allows you to automate trivial tasks that otherwise take away your valuable time. It also allows you to do things quickly.
8 Free Linux Courses for Programmers and IT Professionals to Learn Online [2025]
Linux is one of the most popular operating systems to run server-side applications. I have seen almost all Java applications running on Linux, barring a couple of them, which run on Windows as a service. If you take out standalone apps like IDEs or tools, most of the real-world Java applications run on Linux, like payment gateways, trading systems, and other financial applications. That's why it's essential for any programmer, IT professional, or developer to learn and understand Linux, both the operating system, as well as the command line.
How to call REST API an send HTTP GET and POST Request using cURL command in Linux? Example Tutorial
The curl or cURL command of Linux is a compelling and versatile command which allows you to send sophisticated HTTP requests right from your Linux command line window. You can use the cURL command to test your RESTful Web Services by sending GET and POST requests, doing authentication, saving a cookie in the file, etc. The curl command is, in fact, the go-to tool for many Java and Spring developers working in web applications and consuming data from the secured RESTful Web Services. Still, you can also use it to test your simple REST Web APIs without security. I have used it many times to check if our Web service is up or not, or is there any error while accessing those services.
Top 10 Bash + UNIX Interview Questions and Answers
Hello guys, bash is a wonderful command line tool which can be used to automate trivial task. I have written cleanup scripts, start and stop scripts and even schedule jobs using bash and crontab command. Since bash is super useful for anyone running their application in Linux its also a key skill for developers and IT support. Because of that you will always find a couple of questions related to bash on developer interviews. In the past, I have shared Linux interview questions and today I am going to share a couple of bash interview questions which is asked to me throughout the years. If you have worked in bash shell then you can easily answer these questions but if you find it trouble, maybe it's time to revise your bash concepts.
Top 15 UNIX and Linux Interview Questions Answers for 1to 3 Years Experienced
UNIX and Linux Interview Questions and Answers
Hello guys, if you are preparing for technical interviews like Software developer or IT support and looking for some frequently asked Linux and UNIX interview questions then you have come to the right place. In the past, I have shared free Linux courses and today, I am going to share popular Linux and UNIX questions from technical interviews. You might already know that questions from various UNIX operating systems like Solaris, Linux, IBM AIX, or any other UNIX operating system are asked on different support and programming interviews and a good knowledge of essential UNIX concepts and commands goes a long way in cracking these interview as well as working efficiently in your day job.
10 examples of crontab commands in Linux
Hello guys, if you are working in Linux or UNIX environment and scheduled any job or script to run at a particular time at everyday like a script to archive log files at midnight or a script to restart your app on Monday morning then you must have come across crontab command in Linux. While there are many solution to schedule jobs in enterprise application like Control M from Bmc Software and AutoSys but the crontab command provides the easiest way to schedule any script in Linux, as you don't need any third party software for scheduling. It's also quite popular, so much so that all the jobs scheduled by crontab is called cron jobs, and that's why I think every developer should know about crontab command and how to use it.
Top 20 Shell Scripting Interview Questions and Answers
Have you struggle with Shell Scripting interview questions before? Have you been having problems in finding out the kind of questions asked in a Shell Scripting interview? If you have experienced this then it is high time that you find a solution. You cannot lose that dream job anymore and yet you can find with ease all you require to pass your interview. If that interview is a few days away, worry no more because you will get before that panel fully prepared and ready for the day by going through these common shell scripting questions.
How to use lsof command in Linux? Example Tutorial
Hello guys, If you want to learn how to use lsof command in Linux then you have come to the right place. In the last few article, I talk about find, grep, mailx, crontable and du command in Linux and in this article I am going to talk about another useful Linux command, the lsof command. The lsof command lists open files and that's why its named lsof. This command is very important for server side developer and IT support people who need to check which file is held by which process and find the deleted files which are hogging memory etc. It act as a useful debugging and troubleshooting tool in Linux.
10 Examples of nslookup command in Linux and Windows
Hello guys, if you are wondering what is nslookup command and how to use in
Linux and Windows then you are at right place. In the past, I have shared
examples of
crontab,
find,
grep,
netstat, and
curl command
and In this article, I will share 10 different examples of nslookup command,
each using its different powerful command line option to give you the tool you
need to deal with networking related queries. I often use nslookup command
to convert a given IP address to hostname or a given
hostname to IP address. For example, when I see an IP address in our log file and want to find which
host that request is coming from, I use nslookup.
10 Examples of head and tail command in Linux
Hello guys, if you are wondering how to use head and tail command in Linux then you have come to the right place. Both head and command are great tool to view content from files in Linux. As the name suggest, "head" is used to view the top portion of the file and "tail" is used to see the file content from bottom. For example when you say "head data.json" then it will display first 10 lines of the file and when you say "tail data.json" then it will display last 10 lines of the file. As a Java developer, I find myself using tail more often than head while checking logs. As you can use tail to see the last few lines of the log file and you can also use tail -f application.log to see the logs rolling in real time. I often use this command to track request and see what application is doing at a particular time.
10 Examples of more and less command in Linux
Hello guys, if you have been working on Linux then you must have come across less and more commands. They are the most popular command to view content of a file, particular log file in Linux. In fact, less is my favorite command to see the logs in Linux because you can open both normal log file as well as a gzip or compressed log file using less command for viewing. It's also very well designed and fast command and you easily open even large log files using less which you would otherwise struggle to open using Windows tool like Notepad or Notepad++. In the past, I have shared examples of lsof, curl, netstat, and ssh command and in this article, I am going to share common examples of both less and more command.
10 Example of SSH Command in UNIX and Linux
SSH command stands for Secure Shell which allows user to securely login into remote machine. If you are working on network on UNIX and Linux machine, SSH command is your friend because with ssh in UNIX you can not easily navigate from one host to other. SSH Command or SSH client in UNIX not only allow you to login into remote host but also allows you to execute command on remote machine without going to into remote server. which is quite convenient while writing bash scripts or getting general information about server like uptime of remote server. This article shows examples of ssh command in UNIX and different usage of ssh in UNIX along with basic concept of ssh command.
10 Examples of wget command in Linux
Hey there! Today's article will explain the "wget" command in Linux and 10 different examples. If you are a Linux user, this is a command you will commonly use almost every now and then.
WHAT IS THE "WGET" COMMAND?
Wget
emanated from the GNU project. It is a non-interactive tool used to
download files from the web. It is called non-interactive because it
does not need human interaction before it operates. the user does not
have to log on before it works. This means that it works in the
background. Wget supports HTTP, HTTPS, FTPS,SFTP.
"wget"
is very beneficial in such a way that, If you are downloading a file
and unfortunately the network connection becomes unstable and slow, It
keeps retrying until the file is fully recovered.
Before you can
start using "wget" command, you must have installed that on your Linux.
if not It won't recognize that command if you type it.
10 Examples of netstat command in Linux and UNIX
Hello guys, if you are wondering how to check which application is listening to a particular port or wondering what are active UDP and TCP post on your machine then don't worry, you can use the "netstat" command in Linux to get these details. Along with lsof and curl, netstat is another important utility command which I use on almost daily basis as a server side Java developer. Since most of the application I create follow client server model and most of them run on Linux, I often use netstat command during post implementation checks and troubleshooting during any production issue.
10 Examples of ls command in Linux
Hey there, if you are wondering how to check what inside a directory or just wondering what is ls command in Linux and how to use it to list files then you have come to the right place. Earlier, I have shared examples of df command, du command, find command, grep command, tar command and chmod command and in today’s article we shall be looking at 10 different examples of ls command in Linux. But before then you would need the meaning of ls and what it is being used for. The goal of this article is to get you comfortable with different things you could do with the ls command and this articles would show you in details how to use it, when to use it and it’s benefits. Let’s go
10 Examples of ps command in Linux
In Today's article, You will be learning about the "ps" command in Linux and our objectives are:
To know what Ps stands for, how it works with numerous options, and provide different examples and the usage of it.
PS stands for processes status. Basically used to list the processes that are running at the moment. As we all know that when a task needs to be implemented it must follow or have a process. There are different options you could use with it and this gives you a different result.
10 Examples of df Command in Linux and UNIX
Hello, In Today’s article we shall be talking about the df command in Linux. The objectives of this article are: What is the df command, and what does it mean? How is it used? I shall be providing 10 different examples or scenarios for it and when to use it
What does df mean?
The meaning of df in Linux is disk-free or disk file system. Which is used to display the file system in the likes of total storage space, available storage space and etc.
Df command in Linux is a command or syntax in Linux that you doing away with it is almost impossible
You may begin to wonder or ask Why or When do You need to use it?
What does df mean?
The meaning of df in Linux is disk-free or disk file system. Which is used to display the file system in the likes of total storage space, available storage space and etc.
Df command in Linux is a command or syntax in Linux that you doing away with it is almost impossible
You may begin to wonder or ask Why or When do You need to use it?
How to use recursive grep command in Linux and UNIX? grep -iR Example tutorial
Hello guys, one of the most common tasks while working on programming projects is finding files containing some specific text like you have your application deployed in the Linux server, and you are migrating your database from one server to another. Now, you want to file all config files and scripts which are referencing your old database using the hostname or IP address, so that you can replace them with an alias. Well, you should always use an alias to connect to the database or any other system, but sometimes it happens you have to use a hostname. Anyway, how do you find all those files containing hostname in your Linux machine? Well, the grep command is here to help you.
Subscribe to:
Posts (Atom)