Linux

Learn how to output the list of open TCP and UDP ports in Linux, as well as their IP addresses and ports using the netstat command.

Learn how to count files and folders contained in directories and subdirectories in Linux using the ls, find, and wc commands.

Learn how to output the size of directories and subdirectories in a human-readable format in Linux and macOS using the du command.

Understand how to use chmod to change the permissions of files and directories. See examples with various chmod options.

How to send valid HTTP POST requests with JSON data payloads using the curl command and how to avoid common syntax pitfalls. Also, how to solve the HTTP 405 error code.

Learn how to filter and format the content of files and the output of commands in Linux using the awk command.

Learn how to manually and automatically create and list groups in Linux.

Learn how to switch between users, log in as another user, and execute commands as another user in Linux.

Learn how to remove local and remote user accounts and associated groups and files in Linux using the userdel and deluser commands.

Learn how to selectively delete files in Linux based on patterns and properties using the rm command.

Learn how to find and filter files in Linux by owner, size, date, type and content using the find command.

Learn how to safely and recursively copy one or more files locally and remotely in Linux using the cp and scp command.