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 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.
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 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.
Difference between Soft Link vs Hard Links in Linux/UNIX? Answer
Hello guys, if you are looking to find out the difference between a soft link and a hard link in Linux then you have come to the right place. Earlier, I have shared the free Linux courses for beginners and in this article, I am going to explain the soft links and hard links in UNIX operator systems like Linux. There are two types of links in the UNIX system, hard links and soft links, also known as symbolic links or symlinks. Though both points to some other source, there is a lot of difference between them. The most important difference is that a hard link is a direct pointer to the inode of the original file. If you compare the original file with the hard link there won't be any differences between them.
How to Find large Files and Directories with size in Linux and UNIX? find + du command Example Tutorial
One of the common problems while working in Linux is finding large files to free some space. Suppose, your file system is full and you are receiving an alert to remove spaces or if your host is run out of space and your server is not starting up, the first thing you do is find the top 10 largest files and see if you can delete them. Usually, old files, large Java heap dumps are good candidates for removal and freeing up some space. If you are running Java applications like core Java-based programs or web applications running on Tomcat then you can remove those heap dump files and free some space, but the big question is how do you find those? How do you know the size of the biggest file in your file system, especially if you don't know which directory it is? We'll try to find answers to some of those questions in this article.
How to send Email with Body and Attachment from Linux Machine? mutt and mailx command Example
One of the common tasks for programmers working in a Linux machine is to send emails and transfer files from Linux machine to Windows machine. While there are utilities like WinSCP which you can use to transfer files between Windows and Linux machine, I generally found using mailx command much easier, especially when you don't have WinSCP or any other utility. But, apart from transferring files between Linux and Windows, there are many more scenarios where you need to send emails from Linux machine, for example, your Java applications are running on Linux like RHEL 5 or RHEL 6 version and you need to send a report of all the clients connecting to your application.
How to backup and load Cron Jobs from a File in Linux and UNIX? Crontab Command Example
Hello guys, If you have been using Linux for some time then you might know about cron jobs. They are the scheduler that can be used to automatically start processes in a Linux box. I have worked on many projects which used cron jobs to start the Java process and environment daily or weekly basis. They are similar to Autosys when it comes to scheduling jobs but cron is a Linux command as opposed to Autosys which is a separate application altogether. In Linux, the crontab command is used for scheduling and automating jobs or processes. You can also use it for loading cron jobs from a file, listing existing cron entries, and editing them. It manages the cron table that is used by the cron daemon in Linux to execute the cron jobs.
How to find swap space and usage in Solaris? Swap Command Example
Swap space in Solaris or any UNIX host is a vital disk space that is used for the swapping process from physical memory (RAM) to disk. Virtual memory allows a process to run even if physical memory gets full by using swap space (which is located on your hard disk) to swap out memory pages that are not currently in use. This is a very important concept which every programmer and Linux user should know. It is even more important if you are working in IT support or as a system admin because if swap space is full then swapping will fail and no new process will be able to start.
3 Examples of for loop in Linux and Bash Script [Tutorial]
Hello guys, if you want to learn how to use for loop in bash or Linux then you have come to the right place. Earlier, I have shared free Linux courses and free bash scripting courses, and today, I am going to share three simple examples of using for loop in Linux. If you are a Programmer, Software Engineer, or System Administrator working in a UNIX or Linux environment, then you will probably find the shell 'for' loop to be a handy tool for automating simple command-line tasks. This is the single command which has helped me a lot while doing production support and performing operational tasks.
10 Examples of df Command in Linux
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?
Unix command to find IP address from hostname - Linux example
The IP address from hostname in UNIX
In this Unix command tutorial, we will see how to find the IP address of
any host in a UNIX based system, like Linux, Solaris, or IBM AIX. In general
hostname and IP address are two important things about any host in a UNIX based
network. You always need either a hostname
or IP address to connect to any host. Sometimes you want to find the IP address of the localhost, sometimes the IP address of another host on the network, etc. We have shown
some techniques to find the IP address from hostname in UNIX and here we will see is a particular list of
UNIX commands to get the IP address of local host or host on which you are working along
with any other host for which we know hostname.
How to find symbolic link or soft link in Linux? ls + find command Example Tutorial
There are two ways you can find a symbolic link or soft link in UNIX based operating systems like Linux, Solaris, BSD, or IBM AIX. The first way is by using the ls command in UNIX which displays files, directories, and links in any directory and the other way is by using UNIX find command which has the ability to search any kind of file e.g. file, directory, or link. In this UNIX command tutorial, we will see examples of both of these UNIX commands for finding a soft link in any directory. If you are new to UNIX operating system and not familiar with the concept of the soft link and hard link, I would recommend getting a good hand on it, as it is one of the most powerful features of UNIX based system.
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