diff --git a/IT/git.md b/IT/git.md
deleted file mode 100644
index 407d07e..0000000
--- a/IT/git.md
+++ /dev/null
@@ -1,40 +0,0 @@
-# git
-
-## delete a file only from git repository
-
-`git rm -rf --cached`
-
-## delete a file from complete history
-
-be carefull can't push repo last time use
-
-`git filter-branch --index-filter "git rm -rf --cached --ignore-unmatch logbook.md" HEAD`
-
-## example de déclencheur git
-
-```bash
-#!/bin/bash
-GIT_REPO=`pwd`
-SITE_NAME=notebook
-TMP_GIT_CLONE="/tmp/$SITE_NAME"
-PUBLIC_WWW="/usr/share/nginx/html/$SITE_NAME"
-# get branch name
-if ! [ -t 0 ]; then
-  read -a ref
-fi
-IFS='/' read -ra REF <<< "${ref[2]}"
-branch="${REF[2]}"
-
-if [ "master" == "$branch" ]; then
-mkdir -p $TMP_GIT_CLONE
-echo "download repo"
-git clone --recursive $GIT_REPO $TMP_GIT_CLONE
-cd $TMP_GIT_CLONE
-export PATH="$HOME/.local/bin:$PATH"
-make install -e BUILDDIR=$PUBLIC_WWW
-echo "Cleaning up"
-rm -Rf $TMP_GIT_CLONE
-fi
-exit
-
-```
diff --git a/IT/git/Rewrite_History.md b/IT/git/Rewrite_History.md
new file mode 100644
index 0000000..b8b41e1
--- /dev/null
+++ b/IT/git/Rewrite_History.md
@@ -0,0 +1,47 @@
+# Rewrite Git History
+
+## Changing the Last Commit
+
+If you want to modify your last commit message:
+
+`git commit --amend`
+
+## Rewrite multiple Commit
+
+for that you need to use rebase in interactive mode like this:
+
+` git rebase -i HEAD^3 `
+
+this will open an editor wit list of commit you need to modiy this with needed action to do
+
+### Reordering Commit
+
+ON this editor you can invert line to change commit order, git will reaply commit in wew order
+
+### Squash & fixup commit
+
+**Squash** option will merge will merge xommit with the previous and ad commit message in the new commit message
+
+**Fixup** do same thing put forgot commit message
+
+### Splitting a Commit
+
+you can do that with **edit** command
+
+git rebase will stop after apply commit where you hae put edit
+
+ad this moment you can process to a Head reset and commit when you want to add commit modification like ewample below
+
+```sh
+git reset HEAD^
+git add README
+git commit -m 'Update README formatting'
+git add lib/simplegit.rb
+git commit -m 'Add blame'
+git rebase --continue
+```
+
+### delete
+
+**drop** will delete comite rebase will not apply modification during processing
+to use by example if you have done a modifcation and a revert 
diff --git a/IT/git/git.md b/IT/git/git.md
new file mode 100644
index 0000000..f004850
--- /dev/null
+++ b/IT/git/git.md
@@ -0,0 +1,66 @@
+# git
+
+## Add in staging only a part of modification done in a file
+
+`git add -p`
+
+this will ask if you want to add each modification with this option:
+
+- *y* - Yes, add this hunk
+- *n* - No, don’t add this hunk
+- *d* - No, don’t add this hunk and all other remaining hunks. Useful if you’ve already added what you want to, and want to skip over the rest
+- *s* - Split the hunk into smaller hunks. This only works if there’s unchanged lines between the changes in the displayed hunk, so this wouldn’t have any effect in the example above
+- *e* - Manually edit the hunk. This is probably the most powerful option. As promised, it will open the hunk in a text editor and you can edit it to your hearts content
+
+## delete a file only from git repository
+
+`git rm -rf --cached`
+
+## delete a file from complete history
+
+be carefull can't push repo last time use
+
+`git filter-branch --tree-filter 'rm -f passwords.txt' HEAD`
+
+## changing email adress
+
+```
+$ git filter-branch --commit-filter '
+        if [ "$GIT_AUTHOR_EMAIL" = "schacon@localhost" ];
+        then
+                GIT_AUTHOR_NAME="Scott Chacon";
+                GIT_AUTHOR_EMAIL="schacon@example.com";
+                git commit-tree "$@";
+        else
+                git commit-tree "$@";
+        fi' HEAD
+```
+
+## example de déclencheur git dans un dépot git
+
+```bash
+#!/bin/bash
+GIT_REPO=`pwd`
+SITE_NAME=notebook
+TMP_GIT_CLONE="/tmp/$SITE_NAME"
+PUBLIC_WWW="/usr/share/nginx/html/$SITE_NAME"
+# get branch name
+if ! [ -t 0 ]; then
+  read -a ref
+fi
+IFS='/' read -ra REF <<< "${ref[2]}"
+branch="${REF[2]}"
+
+if [ "master" == "$branch" ]; then
+mkdir -p $TMP_GIT_CLONE
+echo "download repo"
+git clone --recursive $GIT_REPO $TMP_GIT_CLONE
+cd $TMP_GIT_CLONE
+export PATH="$HOME/.local/bin:$PATH"
+make install -e BUILDDIR=$PUBLIC_WWW
+echo "Cleaning up"
+rm -Rf $TMP_GIT_CLONE
+fi
+exit
+
+```