CoreIntermediate35 min read
3. Exit codes & scripts
Linux Shell Daily · 12 pages source format
$? and simple bash scripts for repetitive checks.
What you'll learn
- Exit codes
- set -e
- Tiny scripts
Key idea
0 means success; non-zero means failure — CI depends on this.
Quick check
Exit code 0 usually means…
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Write 3 notes on: Exit codes.
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Practice
Write a 10-line script that greps a log and exits 1 if errors exist.
#!/usr/bin/env bash
set -euo pipefail
grep -q ERROR "$1" && exit 1 || exit 0Do this now
Commit one file practicing Exit codes.
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