The “$?” is a built-in variable that your shell uses to store the exit status code of the last executed command in integer format and remains unchanged unless the next command is executed. Using this exit status code, you can debug the problem that occurred
The unset command is a built-in Linux command used for flushing the value of variables or functions during program execution. Tutorial Details Description Unset Difficulty Level Low Root or Sudo Privileges No OS Compatibility Ubuntu, Manjaro, Fedora, etc. Prerequisites unset Internet Required No Syntax of
The set command is a built-in Linux command that can display or modify the value of shell attributes and positional parameters inside the current shell environment. This modification can help to debug your script by finding undefined variables, errors, job control, printing commands as they
Whenever you start a new shell session (by opening a terminal), a set of environment variables is loaded from the shell configuration file into your current shell session. These environment variables determine different customizations in your shell, like the default editor using “$EDITOR“, or setting
The PS, a.k.a. “process status”, is a native command-line utility for UNIX-based systems to monitor the currently running processes in your system. It reads the information from the virtual files in the /proc filesystem and gives the running processes information like memory consumption, CPU usage,
How do I write and run a shell script on Linux? Is there a way to run a shell script without executable permission, or can we run a shell script directly from a URL? Don’t worry; you are about to learn all those things in
The bash (Bourne-Again SHell) is a sh-compatible command-line interpreter that reads from standard input or from a file and gives you the resulting output. We have already written an article about bash and its differences from the standard POSIX shell. Today, you will learn how
Before understanding what is Bash shell, you must be familiar with the concepts of a command-line interpreter and Linux Shell (or sh). What is a Command-Line Interpreter? The term “command-line interpreter” refers to a program or text-based interface that sits between the user and the
In Linux, you might already be navigating through different directories without knowing whether an absolute or relative path is being used. It becomes important for you to understand them when you are working with scripts, navigating through different user or root directories, or creating symbolic
The GUI text editor gives you a separate panel in the footer to inform you of the number of words, lines, and characters in your text file. Even though you can easily find the number of strings that occurred in your text file using this
The WC command is used to count various parameters from the specified file, like the number of lines, word counts, byte counts, character counts, and many more. Tutorial Details Description WC (Word Count) Difficulty Level Low Root or Sudo Privileges No OS Compatibility Ubuntu, Manjaro,
The eval command is used to execute specified arguments as a single command in the current command-line processing and return its result. It will combine (or construct) the arguments into a single string and use it as input to the shell, which will execute the
