Learn Bash

What Is Bash? Why Learn Bash? What Can You Do With Bash? Opening a Terminal Your First Commands How the Shell Runs Commands Navigating the File System Working with Files and Directories Viewing Files Wildcards and Globbing Redirection: Sending Output to Files Pipes: Connecting Commands Your First Script Variables Quoting Command Substitution Arithmetic Script Arguments Reading Input Exit Codes, &&, and || Conditionals: if and Tests File and String Tests The case Statement for Loops while Loops and Reading Files break and continue File Permissions Comments, Style, and ShellCheck

Functions Local Variables and Return Values Arrays Associative Arrays String Manipulation Error Handling in Scripts Parsing Options with getopts Searching Text with grep Editing Text with sed Processing Columns with awk The Text Toolkit: sort, uniq, cut, tr, and Friends Finding Files: find and xargs Processes and Job Control Environment Variables and Configuration printf and Here Documents Dates and Times Archives and Compression Working with JSON and APIs Debugging Scripts Testing Scripts with Bats

Strict Mode: set -euo pipefail Traps and Cleanup Advanced Expansions and Shell Options Subshells, Grouping, and Process Substitution Concurrency and Locking Handling File Names Safely Regular Expressions in Bash Portability and POSIX sh Performance Security for Shell Scripts Logging and User-Friendly Output Scheduling: cron and systemd Timers Remote Automation with SSH Shell in Containers and CI Structuring Larger Scripts and Tools When to Use Another Language