X-Git-Url: https://git.xandkar.net/?p=git-cheat-sheet.git;a=blobdiff_plain;f=README.md;h=3dbce00338f4f05879d30dcba712e7f87206389e;hp=bca3d59d8b7bef65182a80dbfcda8fdd5c017d64;hb=fe79085123faf9e524caa33bf00f0024b6589960;hpb=6b6ba9f3495de246fe962f2b23fc62b966c3ab5b

diff --git a/README.md b/README.md
index bca3d59..3dbce00 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ How to do stuff with git
 Splitting a repo
 ----------------
 
-### Remove history of all but select files in cloned repo
+##### Remove history of all but select files in cloned repo
 ```sh
-$ cp -Rp old new
+$ git clone old new
 $ cd new
 $ git clean -dfx
 $ git gc --aggressive --prune=now
@@ -27,9 +27,28 @@ $ git filter-branch \
 $ git gc --aggressive --prune=now
 ```
 
-### Remove history of previously-removed (not in current tree) files
+##### Remove history of previously-removed (not in current tree) files
 ```sh
-$ git log --pretty=format: --name-status | awk '$0 != "" {print $2}' | sort -u > /tmp/tree.old
+$ git log --pretty=format: --name-status \
+    | awk '$0 != "" {print $2}' \
+    | sort -u > /tmp/tree.old
 $ git ls-tree -r --name-only HEAD > /tmp/tree.new
-$ git filter-branch --prune-empty --index-filter 'grep -Fvxf /tmp/tree.new /tmp/tree.old | xargs git rm --cached -r --ignore-unmatch' HEAD
+$ git filter-branch \
+    --prune-empty \
+    --index-filter '
+        grep -Fvxf /tmp/tree.new /tmp/tree.old \
+        | xargs git rm --cached -r --ignore-unmatch
+    ' \
+    HEAD
+```
+
+
+Inserting a new root commit
+---------------------------
+```sh
+git checkout --orphan $TEMP_BRANCH
+git rm -rf .
+git commit --allow-empty -m $INIT_COMMIT_MSG
+git rebase --onto $TEMP_BRANCH --root $MAIN_BRANCH
+git branch -d $TEMP_BRANCH
 ```