Git Find a Commit by Its Message
You remember fixing a payment bug last month. But can you find that exact commit among hundreds of Git commits?
Scrolling through history to find one change is slow and frustrating. Git has a built-in answer: git log --grep, which filters commits by what their messages say.
This 2-minute explainer walks through it with a Ruby on Rails example: finding an old payment-validation fix, opening it with git show, and reading the exact lines that changed.
What you'll learn:
- What git log --grep does
- How to search commit messages by keyword
- How to ignore letter case
- How to search with multiple patterns
- How to search across all branches
- How to inspect a matching commit with git show
The commands:
# search commit messages
git log --oneline --grep="payment"
# ignore letter case
git log --oneline --grep="PAYMENT" -i
# require every pattern to match
git log --oneline --grep="payment" --grep="invoice" --all-match
# search across all refs, not just the current branch
git log --all --oneline --grep="payment"
# open the commit you found
git show b23cd45
Three things worth remembering:
1. --grep searches commit messages, not source code. Finding a change by what the code says needs a different tool.
2. With several --grep patterns, a commit matches if ANY of them matches. Add --all-match to require all of them.
3. Results are only as good as the messages. Search for "payment" and you'll miss a commit that says "Fix checkout validation" — clear commit messages are what make this work.
Chapters:
00:00 — Where Is That Commit?
00:10 — The Problem with Searching Git History
00:25 — What Is git log --grep?
00:40 — How to Search Commit Messages
01:00 — Practical Rails Example
01:25 — Benefits and Limitations
01:45 — The Takeaway
Don't scroll. Search your Git history.
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