Searching history with git log -S - Step-by-Step Execution

Process Flow - Searching history with git log -S

Start: User runs git log -S"text"

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Git scans commits

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Check each commit diff for added/removed 'text'

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If found, include commit in output

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Display matching commits

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End

The git log -S command scans commit history to find commits that added or removed a specific text string, then shows those commits.

Execution Sample

Git

git log -S"fix bug" --oneline
# Shows commits where 'fix bug' was added or removed

This command searches commit history for changes adding or removing the phrase 'fix bug' and lists those commits briefly.

Process Table

Step	Action	Commit Checked	Text Found in Diff?	Include in Output
1	Check commit abc123	abc123	No	No
2	Check commit def456	def456	Yes (added 'fix bug')	Yes
3	Check commit 789abc	789abc	No	No
4	Check commit 456def	456def	Yes (removed 'fix bug')	Yes
5	Check commit 123789	123789	No	No
6	End of commits	-	-	-

💡 All commits checked; output includes only commits where 'fix bug' was added or removed.

Status Tracker

Variable	Start	After 1	After 2	After 3	After 4	After 5	Final
Current Commit	-	abc123	def456	789abc	456def	123789	-
Text Found	False	False	True	False	True	False	-
Output List	[]	[]	[def456]	[def456]	[def456, 456def]	[def456, 456def]	[def456, 456def]

Key Moments - 2 Insights

Why does git log -S only show commits where the text was added or removed, not just present?

Because git log -S searches for changes that add or remove the exact text, not just commits containing the text. See execution_table rows 2 and 4 where text was added or removed, so those commits are included.

What happens if the text appears in a commit but was not changed in that commit?

That commit is not included because git log -S looks for changes adding or removing the text, not just presence. See execution_table rows 1 and 3 where text was not found in the diff, so commits are excluded.

Visual Quiz - 3 Questions

Look at the execution table, which commit was the first to include the searched text change?

A def456

B 789abc

C abc123

D 456def

💡 Hint

Check the 'Text Found in Diff?' column in the execution_table for the first 'Yes'.

At which step does the output list first include a commit?

A After step 1

B After step 2

C After step 3

D After step 4

💡 Hint

Look at the 'Output List' variable in variable_tracker after each step.

If the text was only removed but never added, which commits would git log -S show?

A Only commits where text was added

B All commits containing the text

C Only commits where text was removed

D No commits

💡 Hint

git log -S shows commits where text was added or removed, see execution_table rows 2 and 4.

Concept Snapshot

git log -S"text"
Searches commit history for commits that add or remove 'text'.
Only commits with changes adding/removing the exact string appear.
Useful to find when a specific code or text change happened.
Combine with options like --oneline for brief output.

Full Transcript

The git log -S command helps find commits where a specific text was added or removed. It scans each commit's changes (diffs) and includes only those commits where the searched text appears as a change, not just present. For example, running git log -S"fix bug" lists commits that added or removed the phrase 'fix bug'. The execution table shows step-by-step how git checks each commit and decides whether to include it based on the presence of the text in the diff. Variables track the current commit, whether the text was found, and the growing list of output commits. Key points are that git log -S focuses on changes, not just presence, and that commits without changes to the text are excluded. This helps developers quickly find when a bug fix or feature was introduced or removed in the code history.