Complete Linux Bootcamp for Beginners

Remove non empty directories with rm -R, and observe verbose output via -v. Learn why rmdir cannot delete non empty folders and how to manage files inside a version directory.

Create and display files with cat, redirect input/output using > and < to files or from files, and pipe data to wc to count words.

Learn to make a shell script executable by moving it to /usr/local/bin and using sudo, so you can run it as hello from anywhere without prefixing with ./.

Learn to create and modify shell variables, assign strings, and echo values with the $variable and $((...)) syntax. Understand unsetting variables, handling empty values, and quotes for interpolation.

Learn how bash rc runs on every terminal start, create a persistent alias file in your home directory, and load dot bash aliases to remember commands like cd.

Develop a bash guessing game that generates a random number between one and the limit, seeding with the script's PID, using a while loop with if-elif-else, prompts, and counting guesses.

Explore bash loops in shell scripts, including for, while, and until forms. Generate sequences with the sequence command and the 1..n bracket range, and compare overhead and alternatives.

Explore the bash case statement by building a multi-branch menu that routes choices to directories using a bash dir variable and regular expressions.

Master grep switches -i, -v, and -c to filter, invert matches, and count results across directories, with practical examples using file patterns and directories.

Explore grep switches -l, -L, -n, and -h to display only matching files, print line numbers, or suppress file names, and begin exploring regular expression syntax.

Learn how to discover grep's command line options via the man page, explore extended, basic, and perl regex modes, and leverage patterns from files or switches.

Discover meta characters in regular expressions, including caret and dollar anchor, dot, backslash, bracketed expressions, alternation, and backreferences, as used with grep and extended regex.

Demonstrates validating emails with grep and regex, building a pattern that starts with letter, allows digits, underscores or dots, includes an at sign, ends with a domain org or com.

Learn to validate US phone numbers with extended regular expressions in grep, matching three-digit groups with optional parentheses and dashes, and anchoring results to the end of the line.

Learn how sed acts as a stream editor that performs substitutions on text using regular expressions. Use s command with delimiters to replace red with blue or ball with wagon.

Master sed addressing notation to print specific lines and ranges, use -n to suppress output, and apply line addresses like 3,5, 3~5, as well as regex-based selection.

Use sed to search a phone list with a regular expression, suppress normal output, print only the matching line numbers, and leverage sed scripting to reuse expressions, grep-like.