How to review diffs between commits
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Up until now, we’ve been using git log --stat to view the changes introduced by new commits. However, this doesn’t show us which lines have been changed in any given file. For this level of detail, we need the git diff command.
For the sake of brevity, only three common case will be described.
Case One
git diff <commit>..<commit> or git diff <commit> <commit>This is to view the changes between two arbitrary <commit>.
For example, we can view the differences between the grandparent and the parent of HEAD.
gif diff HEAD~2..HEAD~1The result as below:
diff --git a/pink.html b/pink.html
index c349233..6d0e147 100644
--- a/pink.html
+++ b/pink.html
@@ -4,10 +4,17 @@
<title>The Pink Page</title>
<link rel="stylesheet" href="style.css" />
<meta charset="utf-8" />
+ <style>
+ div {
+ width: 300px;
+ height: 50px;
+ }
+ </style>
</head>
<body>
<h1 style="color: #F0F">The Pink Page</h1>
<p>Only <span style="color: #F0F">real men</span> wear pink!</p>
+ <div style="background-color: #F0F"></div>
<p><a href="index.html">Return to home page</a></p>
</body>
</html>The diff pinpoints that 7 lines had been added in pink.html.
Case Two
git diffThis form is to view our uncommitted changes.
Open up blue.html, make any kind of change, and save the file. Then, run git diff without any arguments:
git diffWe can see the changes in the blue.html:
diff --git a/blue.html b/blue.html
index 4e38c74..d46efb0 100644
--- a/blue.html
+++ b/blue.html
@@ -1,6 +1,6 @@
<!DOCTYPE html>
<html lang="en">
-
+d1
<head>
<title>The Blue Page</title>
<link rel="stylesheet" href="style.css" />
@@ -14,4 +14,4 @@
</body>
-</html>
\ No newline at end of file
+</html>Case Three
git diff --cachedWe can use the --cached flag to generate a diff between the staged snapshot and the most recent commit:
git add blue.html
git diff --cachedThe diffs as below:
diff --git a/blue.html b/blue.html
index 4e38c74..d46efb0 100644
--- a/blue.html
+++ b/blue.html
@@ -1,6 +1,6 @@
<!DOCTYPE html>
<html lang="en">
-
+d1
<head>
<title>The Blue Page</title>
<link rel="stylesheet" href="style.css" />
@@ -14,4 +14,4 @@
</body>
-</html>
\ No newline at end of file
+</html>We can also see the d1 characters have been added into blue.html.
Conclusions
These are the three main configurations of the git diff command:
git diff <commit>..<commit>orgit diff <commit> <commit>git diffgit diff --cached
References
Ry’s Git Tutorial
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