ns-3 uses the Mercurial software revision control system

Mercurial cheat sheet

clone this repository:
----------------------
hg clone http://code.nsnam.org/ns-3-dev

pull development tree changes to your local repository:
------------------------------------------------------
hg pull http://code.nsnam.org/ns-3-dev
hg update (apply the changes)  OR
hg merge (if you've made local changes)

commit locally:
--------------
hg status
hg add <new files, if any>
hg ci -m "message"

push upwards (developers access only):
--------------------------------------
hg push ssh://code@code.nsnam.org//home/code/repos/ns-3-dev

view the change log:
--------------
hg log <file>

doing a scons make clean:
------------------------
scons -c