Bash Scripting for DevOps: Automation with If, Loops & Functions | Linux Shell Scripting
In this video you will learn:
What shell scripting is and how it automates repetitive Linux tasks using Bash.
How to create your first shell script with shebang, make it executable, and run it.
How to work with variables, command substitution, and user input in Bash scripts.
How to use if/else conditionals, file tests, number comparisons, and string checks.
How to write for and while loops to iterate over ranges, lists, and files.
How to create and call functions, pass arguments, and use return codes.
How exit codes work and how to stop scripts on errors using set -e and simple guards.
How to build practical scripts like backups, log rotation, service monitors, user creation, disk alerts, and system reports.
Best practices for clean scripts: shebang, strict mode, quoting variables, comments, dependency checks, and meaningful file names.
How to debug scripts with bash -x, set -x, shellcheck, and syntax checking with bash -n.
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🏁 Timestamp:
0:00 Introduction – what is shell scripting and why it matters for DevOps
1:30 Creating your first Bash script (shebang, chmod +x, run script)
4:30 Working with variables, command substitution and user input
7:30 If/else conditionals, file tests and numeric comparisons
11:00 For and while loops, ranges and looping over files
14:30 Functions, arguments and return codes
18:00 Exit codes, set -e and basic error handling patterns
21:00 Practical script examples: backup, log rotation, service monitor
25:00 Script best practices: set -euo pipefail, quoting, comments, naming
28:00 Debugging scripts with bash -x, bash -n and shellcheck
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