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--- docs:git:filter-branch [2010/04/14 22:14] – created billh
+++ docs:git:filter-branch [2010/04/14 22:53] (current) – billh
@@ Line 1: / Line 1: @@
 ====== git filter-branch ======
-git filter-branch allows you to rewrite history of any size.  For example, you could change the author's name and email for an entire project.  However, this will change the
+git filter-branch allows you to rewrite history of any size.  For example, you could change the author's name and email for an entire project.  However, this will change the SHA-1 so you can't do this if other people are tracking your project or branch.
+You can change various things conditionally, and if you don't change anything then the commit will go in exactly as it was before.
+===== change date of one or more commits =====
+  * -d <dirname> represents where git will temporarily put the work as the new commits are created
+<code bash>
+#!/bin/bash
+git filter-branch --env-filter '
+  if [ $GIT_COMMIT = "97de3480e040f575bf9615162b197af426cab712" ]; then
+	dt="2005.01.01 00:00:00"
+    export GIT_AUTHOR_DATE=$dt
+    export GIT_COMMITTER_DATE=$dt
+  fi
+  if [ $GIT_COMMIT = "827e1b8b64e37c7eebb1033ce66442ca9397e878" ]; then
+	dt="2006.02.01 00:00:00"
+    export GIT_AUTHOR_DATE=$dt
+    export GIT_COMMITTER_DATE=$dt
+  fi
+  if [ $GIT_COMMIT = "856b9dcc2100bd0c0fe8309023086a32ab582bf5" ]; then
+	dt="2007.03.01 00:00:00"
+    export GIT_AUTHOR_DATE=$dt
+    export GIT_COMMITTER_DATE=$dt
+  fi
+  if [ $GIT_COMMIT = "0cbae41340cbc803eca684e8ad6394af679faa53" ]; then
+	dt="2008.04.01 00:00:00"
+    export GIT_AUTHOR_DATE=$dt
+    export GIT_COMMITTER_DATE=$dt
+  fi
+' -d tmp \
+HEAD
+</code>
+===== remove svn id strings =====
+<code bash>
+git filter-branch --msg-filter '
+        sed -e "/^git-svn-id:/d"
+'
+</code>
+===== See Also =====
+  * [[creating_and_applying_patch_files]]