Found 346 Questions for Linux

How to Create a New File in Linux from Bash?

Kiran Kumar Panigrahi
Updated on 12-Apr-2022 13:23:16
Before getting into the ways of creating a file using Bash, let's first understand how Linux treats its files. Linux organizes all its data into files and files are organized into directories. Further, the directories are organized into tree-like structures called the filesystem. When you have to work in a Linux environment, you would definitely have to spend a lot of your time working on different types of files.There are various ways in which one can create a file in Linux. You can create a file from the Bash Shell or you can use the Desktop File Manager to do ... Read More

Explain JMeter installation in macOS

Debomita Bhattacharjee
Updated on 08-Feb-2022 10:53:02
JMeter installation is done in MacOS by following the below steps −Step1 − Navigate to the below URL − − Navigate to the section Apache JMeter , then click on the link with the .tgz file(to download) as highlighted below −Step3 − Click on the downloaded file, a folder named: apache-jmeter-5.4.3 gets created. Here, 5.4.3 is the JMeter version. Open the folder, we should have the content as shown below −Step4 − Open Terminal and navigate to the location of the bin folder(which is within the apache-jmeter-5.4.3 folder) and run the below command −sh jmeter.shAfter successfully running the above command, ... Read More

What are Alternative Ways to Reverse a String from Shell?

Prateek Jangid
Updated on 29-Nov-2021 10:51:44
In the Linux shell, we have predefined commands to return a reversed string. Anyone can use these commands for reversing an output of the program.Perl CommandIt is a general-purpose programming language in Linux.Inputperl -ne 'chomp;print scalar reverse . "";'

How to Reverse a String using Unix Shell Programming?

Prateek Jangid
Updated on 29-Nov-2021 10:46:19
Bash is a shell or command line interpreter. It is a layer programming language that understands and executes the command that a user enters or can read commands from a script. Essentially Bash or Shell allows users of Unix-like systems and Windows via a Windows subsystem for Linux to control the innermost components of the Operating system using text-based commands.In this article, we will discuss a problem to be solved by Shell scripting. We are given a String, and we need to print the reverse of that string using Shell Programming. For example, Input : str = “ Hello ” ... Read More

Resetting a Root Password in Linux without External Media

Prateek Jangid
Updated on 26-Nov-2021 06:56:45
Discuss how to recover the root password of Linux without using any external media. The version of Linux we are working with is CentOS version 8.2. Still, the procedures we will see can work with any Linux distro and many others. You may find that it doesn’t work with some Debian-based distro.To do this exercise, you should have the following requisites Prerequisites −Willingness to work in the Linux command line environment.Physical access to the Linux server(it cannot do this across a network).Procedures to follow to change the root passwordRestart the computer and interrupt the boot process at the grub screen ... Read More

Where can I set environment variables that crontab will use?

Mukul Latiyan
Updated on 31-Jul-2021 12:29:08
In normal cases we make use of the bash_profile or bashrc in case of Ubuntu and zshrc in case of Mac OS, to set our environment variables and then those variables are made available to us everywhere on the terminal we want.Let’s consider a simple example where we have some environment variable in bash_profile and we are making use of it in the terminal.Consider the bash_profile output shown below −immukul@192 dir1 % cat ~/.bash_profile export JAVA_HOME=$(/usr/libexec/java_home) export PATH=$PATH:/usr/local/node/bin export GOROOT=/usr/local/go export GOPATH=/Users/immukul/go_projectsAs we can see there are many variables present in the bash_profile file, we can use these variables in ... Read More

What's the difference between nohup and ampersand (&) on Linux?

Mukul Latiyan
Updated on 31-Jul-2021 12:30:16
Linux provides us with different utility commands that we can make use of to print a random line from any files in the Unix command line. Mostly we make use of either the shuf command or the sort command, and in this article I’ll explain both the commands and which one is better and why.Shuf CommandThe shuf command in Linux is used to write random permutations of the input lines to the standard output. The idea of randomizing the input is the same as one does when the cards are shuffled. On most of the Linux operating systems it is ... Read More

What Linux utility for sorting processes by network usage?

Mukul Latiyan
Updated on 31-Jul-2021 12:32:37
Linux provides the famous top command utility that provides us with all the information about the processes, their time, their respective IDs, how much CPU chunk they are consuming and much more. The only issue with that is the processes are not sorted in any order and the order changes frequently.There are certain cases where we would like the output to be in a sorted manner somehow, like sorted in the sense that the process which is using the most network will be at the top.One such command line program that we can use that will provide us the desired ... Read More

What languages have been used to write Windows, Mac OS and Linux OS?

Mukul Latiyan
Updated on 12-Jul-2022 09:05:15
We know that an operating system is considered the backbone of any system that you may use. The three most common and widely used operating systems share things in common just as well as they share differences. While there are cases where one might outperform another, those cases and such scenarios are very rare.The most notable difference one can notice is how they store the files in their file structure, like in case of windows, it follows a directory structure to store the different kinds of files of the user, whereas the Mac OS file structure is known as MAC ... Read More

What is the sed in-place flag that works both on Mac and Linux?

Mukul Latiyan
Updated on 31-Jul-2021 12:26:24
We know that the SED command in Linux stands for stream editor and is mainly used to perform functions on files, and the functions usually are either searching for a word, or replacing it or insertion of something and few more. It is a very useful command and can be found on the Linux kernel.It should also be noted that the BSD (Berkeley Software Distribution) sed shipped with the OS X does need the -i flag to work and the GNU one doesn’t.One way to make the GNU version of the SED to work on the Mac OS X, is ... Read More