When working with various Linux commands, you may be wondering what version of the command you are using. Of course, the version relates to the binary executable file itself, and traditionally is maintained by the system package manager, which is responsible for checking on updated versions and installing them at the user’s discretion. Commands in Linux typically undergo slow, subtle changes. Some commands have not changed much at all since the 70s, when they were introduced on Unix. Others have new versions developed regularly, and you need to check your version to know which features it has. In this tutorial, you will learn how to check the version of a command on a Linux system.
Commands
How to extract text from PDF document
PDF documents are commonly used to hold lengthy amounts of text, especially for formal matters like contracts or terms and conditions. These PDF documents can prove unwieldy in certain scenarios, since a PDF reader application is required to open them, and a PDF editor must be used for changing the contents.
Bash base64 decode and encode on Linux
Linux commonly uses base64 to encode and decode data. This method of encoding provides a reliable way for data to be transmitted and stored. The encoding process will convert binary data to ASCII characters, making it usable by a variety of services (such as OpenSSL) that require readable ASCII character transmission as opposed to binary. Afterwards, the data can be decoded back to binary data. In this tutorial, you will see how to use the base64 command to decode and encode data on a Linux system.
How to say YES to ALL with cp command
The cp command is used to copy files and directories on a Linux system. If a user tries to copy a file over to a location that already contains the same file name, the default behavior of cp is to overwrite the destination file with the source file. However, on some Linux systems, this behavior can be configured differently, and the user might see a prompt to confirm overwriting in their terminal. When copying many files, this prompt can get repetitive and annoying to deal with. In this tutorial, you will learn how to say YES to ALL with the cp command when trying to copy files via the Linux command line.
How to say YES to ALL with rm command
The rm command is used to delete files on a Linux system. It can be used to delete a lot of files at once, but you will need to use certain options when trying to delete directories or certain files. In this tutorial, you will learn how to say YES to ALL with the rm command when trying to delete files via the Linux command line.
Linux shutdown commands explained
New users are often surprised by the number of commands that can be used to shut down a Linux system. Thanks to the flexibility of Linux and its storied history, there is almost always more than one – or more than a few – ways to accomplish the same task. Although Linux is always giving users plenty of choices on how to operate their system, one method usually proves better for certain scenarios, and all come with their pros and cons.
How to ZIP file with password on Linux
If you have one or more files that you need to send to a friend or store for a long time, compressing the files into a .zip archive is a good way to save on space and combine all files into a single object. If you need to keep the file contents private, for fear that they could be intercepted by the wrong party, or that someone could try to access them on your own system, then it is possible to add a password to your zip file. In this tutorial, you will learn how to zip files and add a password to your zip archive on a Linux system.
How to kill a process by name
When you need to quickly or forcibly close a running process on a Linux system, many users will try to determine the process ID and then kill a process by its ID. While this works fine, it is sometimes easier or more convenient to kill a process by name. This way, we get to skip the step of looking up the process ID, and let our terminal do the work for us.
How to kill process by ID
Everything that is currently running on your Linux system is a process. Some processes are meant to run in the background (application updates, for example), so you may not be readily aware of their existence. And other processes (a web browser, for example) are very apparent, and get started or stopped by the user on a constant basis. All of these processes are assigned an ID number, called PID or “Process ID”, and can be referenced in various situations, including killing a running process via the process ID.
How to echo environment variable on Linux
Environment variables contain data about the current system configuration. These variables are mostly referenced by scripts and system programs that need some information on the current configuration in order to adapt to various scenarios. For example, a script might check an environment variable to see what language is set on the computer, and then output prompts in the target language. One of the most commonly accessed environment variables is the PATH environment variable.
Linux command to quit SSH connection
When it comes to managing remote systems in Linux, the SSH protocol is the most used method. SSH is popular because it allows a user to securely log in to remote devices, including other Linux systems, firewalls, routers, etc. When you are done with your remote management, you can quit out of the SSH connection.
How to install missing ifconfig command on Linux
Most of us longtime Linux users have the ifconfig command seared into our brain, after years of repetitive use. It comes as a shock to some when they type the command and are met with an error message (ifconfig command not found). Indeed, the command has become deprecated, but it’s still possible to install ifconfig command.