As the name implies, we use the join command in Linux to combine data from text files with a common field. This command can be helpful for a variety of system administration situations.
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cd command in Linux with examples
One of the most essential commands in Linux is the change directory command or cd command. This is how you will navigate to different directories throughout your system. Using this command will change your current working directory to a different one you specify.
export command in Linux with examples
The export command in Linux is used to set an environment variable. Environment variables are part of the Linux system shell that contain changing values. They help facilitate scripts and system programs, so that code can accommodate a variety of scenarios. Unlike regular shell variables, environment variables can be accessed system-wide, by any user or process.
find command in Linux with examples
If you need to search for one or more particular files or directories, the find command in Linux is the perfect tool for the job. The find command can search for a file with a specific name, but you can also search for files that follow certain naming patterns. This can be broadened all the way to finding files based on file size, file extension, or a lot of other options.
fold command in Linux with examples
The fold command in Linux is used to wrap the lines of a file at a predetermined length. Its original use was to facilitate the viewing of large files on a terminal screen, and having each line be wrapped at a certain length so everything could fit on the monitor. Back in the 1970s, before terminals and applications had word wrap functionality by default, this was very handy.
nl command in Linux with examples
The nl command in Linux is an abbreviation for number lines. If you’ve ever had a large text document and needed to add line numbers to it, the nl command is your saving grace. Rather than going through the painstaking process of numbering each line manually, or importing your text document into a GUI text editor, you can simply use nl from the command line and be done in a matter of seconds.
cp command in Linux with examples
mv command in Linux with examples
The mv command in Linux is short for move. As you can probably guess or may already know, the command is used to move files and directories from one location to the other. Users that are more accustomed to a GUI might know this action better as “cutting and pasting.” The mv command is just the command line equivalent of that action.
pwd command in Linux with examples
The pwd command in Linux is short for present working directory. When it comes to Linux commands, this has to be one of the simplest. It’s only function is to print the present working directory of your terminal. It comes in handy when you’re not exactly sure what directory you’re in, or when you need to pass the present working directory inside of a Bash script, for example.
head command in Linux with examples
The head command in Linux is one of the most important commands you’ll need when viewing text files. If you’re new to Linux, the head command is a perfect place to start, since it has a simple syntax and straight forward purpose. The head command is the complementary command to the tail command. The head command is used to print the first 10 lines (by default) of one or multiple files.
mkdir command in Linux with examples
One of the most common and fundamental commands in Linux is the mkdir command. The most basic way to use this command is to create one or multiple directories. If you’re coming from Windows as a newcomer to Linux, you probably know directories as folders. The mkdir command can do a few other things with directories as well.