This article describes how to find and replace text in Vim / Vi. Vim is the most popular command-line text editor. It comes preinstalled on macOS and most Linux distributions. Finding and replacing text in Vim is quick and easy. Basic Find and Replace # In Vim, you can find and replace text using the
Bash: Write to File
One of the most common tasks when writing Bash scripts or working on the Linux command line is reading and writing files. This article explains how to write text to a file in Bash, using the redirection operators and tee command. Writing to a File using Redirection Operators # In Bash, the redirection of output
Bash read Command
Bash ships with a number of built-in commands that you can use on the command line or in your shell scripts. In this article, we’ll explore the built-in read command. Bash read Built-in # read is a bash built-in command that reads a line from the standard input (or from the file descriptor) and split
Listing Linux Services with Systemctl
In Linux, a service is a program that runs in the background . Services can be started on-demand or at the boot time. If you are using Linux as your primary operating system or development, platform you will deal with different services such as webserver, ssh or, cron . Knowing how to list running services
How to Use sed to Find and Replace String in Files
When working with text files, you’ll often need to find and replace strings of text in one or more files. The sed is a stream editor. It is used to search, find and replace, insert and delete words and lines. You also can use the regular expressions. In this article we will show you how
How to Use the nmap Command
Nmap is a powerful network scanning tool for security audits and penetration testing. It is one of the essential tools used by network administrators to troubleshooting network connectivity issues and port scanning . Nmap can also detect the Mac address, OS type , service version, and much more. This article explains the basics of how
Linux Head Command
The head command is used to print the few first lines (by default 10 lines) of file or standard output. This tutorial shows you how to use the Linux head command with practical examples. Head Command Syntax# Below is the basic syntax for the head command: head [OPTION]… [FILE]… Here, OPTION – You can pass
How to Rename Files and Directories in Linux
It’s a basic requirement to rename the files and directories on a Linux system. There are two ways to rename files using command-line terminal or via GUI file manager. In this tutorial, we will cover how to rename files and directories using mv and rename commands. Rename Files using mv Command# The mv command is
Linux Time Command
Time command is useful when you want to determine the command execution time. Generally, it’s useful to test the performance of the commands and scripts. In this guide, we will cover how to use the time command in Linux. When you are writing multiple script which doing same job and want to choose better one
How to Redirect stderr to stdout in Bash
Sometimes when you are redirecting the output of a command by piping to another command or to a file, you get the error messages. There are three standard I/O streams, which are used in Bash and other Linux shells when a program is executed. Below are the streams and each representing by the numberic file