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+#GIT MAGIC
+
+## Create a submodule from a specific folder
+```
+git clone <your_project> <your_submodule>
+cd <your_submodule>
+git filter-branch --subdirectory-filter 'path/to/your/submodule' --prune-empty -- --all
+```
+
+## Remove a file from history
+
+```
+git filter-branch --force --index-filter \
+'git rm --cached --ignore-unmatch \#web40.tex\#' \
+--prune-empty --tag-name-filter cat -- --all
+```
+
+## Change commit date
+    git commit --amend --date="Wed Feb 16 14:00 2011 +0100"
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