Introduction

The Linux command free is a command line utility that displays the amount of free and used memory in the system. It is a part of the GNU Core Utilities package and is used to monitor the memory usage of a Linux system. It can be used to check the amount of free and used memory in the system, as well as the amount of swap space available. It can also be used to monitor the memory usage of individual processes. This guide will provide an overview of the free command and how to use it.

Examples

1. ls: Lists the contents of the current directory.

Example: ls

2. cd: Changes the current working directory.

Example: cd Documents

3. mkdir: Creates a new directory.

Example: mkdir my_new_directory

4. rm: Removes a file or directory.

Example: rm my_file.txt

5. mv: Moves or renames a file or directory.

Example: mv my_file.txt my_new_file.txt

6. cp: Copies a file or directory.

Example: cp my_file.txt my_new_file.txt

7. grep: Searches for a pattern in a file or multiple files.

Example: grep “pattern” my_file.txt

8. find: Searches for files in a directory hierarchy.

Example: find / -name my_file.txt

9. chmod: Changes the permissions of a file or directory.

Example: chmod 755 my_file.txt

10. man: Displays the manual page for a command.

Example: man ls

Linux Commands

Linux is a powerful and versatile operating system used by many people around the world. It is open source and free to use, making it a popular choice for users who want to customize their computing experience. To get the most out of Linux, it is important to understand the various commands that are available. Here are some of the most commonly used Linux commands.

ls

The ls command is used to list the contents of a directory. It can be used to view the files and folders in the current directory, or to view the contents of a specific directory. The ls command can also be used to view the permissions of a file or folder.

cd

The cd command is used to change the current working directory. It can be used to navigate to a different directory, or to go back to the previous directory. The cd command can also be used to go to the root directory of the system.

mkdir

The mkdir command is used to create a new directory. It can be used to create a directory in the current working directory, or to create a directory in a specific location. The mkdir command can also be used to create multiple directories at once.

rm

The rm command is used to delete a file or directory. It can be used to delete a single file, or to delete multiple files or directories at once. The rm command can also be used to delete a directory and all of its contents.

chmod

The chmod command is used to change the permissions of a file or directory. It can be used to give a user or group read, write, or execute permissions on a file or directory. The chmod command can also be used to change the ownership of a file or directory.

sudo

The sudo command is used to execute a command as the root user. It can be used to run a command with elevated privileges, or to run a command as a different user. The sudo command can also be used to run a command as a different group.

man

The man command is used to view the manual page for a command. It can be used to view the syntax and usage of a command, as well as to view examples of how to use the command. The man command can also be used to view the manual page for a specific option of a command.