1   $ hg init

     2   $ echo This is file a1 > a

     3   $ hg add a

     4   $ hg commit -m "commit #0" -d "1000000 0"

     5   $ echo This is file b1 > b

     6   $ hg add b

     7   $ hg commit -m "commit #1" -d "1000000 0"

     8   $ hg update 0

     9   0 files updated, 0 files merged, 1 files removed, 0 files unresolved

    10   $ echo This is file c1 > c

    11   $ hg add c

    12   $ hg commit -m "commit #2" -d "1000000 0"

    13   created new head

    14   $ hg merge 1

    15   1 files updated, 0 files merged, 0 files removed, 0 files unresolved

    16   (branch merge, don't forget to commit)

    17   $ rm b

    18   $ echo This is file c22 > c

    19   $ hg commit -m "commit #3" -d "1000000 0"

    20