Bash Scripting Tutorial: set -euo pipefail, Word Splitting, and ShellCheck
Has a simple computer script ever deleted the wrong files? 💥
Bash does not work like normal programming languages such as Python or C. Instead, it acts like a "macro processor"—a simple text-replacement tool.
If you write a command to delete files in a target folder, like rm -rf /var/www/${TARGET_DIR}/*, and that target variable is empty, Bash will just remove the variable and run rm -rf /var/www//*. This simple mistake will delete your entire website!
In this video, we cover:
The 8-Stage Pipeline: How Bash reads your text, splits words, and turns a simple * into a list of all your files.
Double Quotes: Why wrapping your variables in double quotes ("$VAR") protects them from breaking.
Strict Mode (set -euo pipefail): How to force your script to stop instantly if it finds a missing variable or a broken command.
The Cleanup Trap: How to use the trap command to guarantee your system cleans up temporary files, even if the script crashes.
ShellCheck: How to use this automated tool to check your code for hidden bugs before you ever press run.
Learn how to write safe, professional scripts that will not break your servers!
⏱️ Timestamps
0:00 – The dangerous rm -rf bug explained
0:34 – Why Bash is different from Python
1:06 – The 8-Stage Expansion Pipeline
1:48 – How double quotes save your code
2:45 – The danger of silent errors in automation
2:52 – How to use set -euo pipefail (Strict Mode)
4:24 – Using trap for safe cleanups
5:06 – Finding bugs early with ShellCheck
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