git modification

IT/git/Git.md

@@ -1,4 +1,8 @@
 # git
+![git](../img/git.jpg)
+## Clone with submodule recurse
+
+add *--recurse-submodules* to clone command
 
 ## Add in staging only a part of modification done in a file
 

IT/git/submodule.md

@@ -0,0 +1,35 @@
+# submodule
+
+Git submodule allows ro add externel repository in a repository
+
+## Adding submodule
+
+- ```git submodule add http://git/toto.git $path```
+ this command add *http://git/toto.git* in *path* directory (add -b $branchname to follow specific branch)
+- after that you need to add and commit submodule folder
+
+to populate a submodule nested in other submodule
+
+- ```git submodule init```
+- ```git submodule update```
+
+## removing submodule
+
+- remove submodule entry in *.gitmodules*
+- remove submodule entry in *.git/config* (only present when **git submodule init** have been perform)
+- remove submodule path ```git rm --cached $path```
+
+## Updating submodule
+
+
+you can update a submodule Manually going in submodule folder and perform a ```git fetch``` and ```git merge```
+
+
+### Fetch and merge
+automatic process
+- perform a ```git submodule update --remote```
+
+
+in  each case you need to commit update in project
+
+