1   $ rm -rf a

     2   $ hg init a

     3   $ cd a

     4   $ echo a > a

     5   $ hg ci -Am0

     6   adding a

     7   $ hg tag t1 # 1

     8   $ hg tag --remove t1 # 2

     9 

    10   $ hg co 1

    11   1 files updated, 0 files merged, 0 files removed, 0 files unresolved

    12   $ hg tag -f -r0 t1

    13   $ hg tags

    14   tip                                3:a49829c4fc11

    15   t1                                 0:f7b1eb17ad24

    16 

    17   $ cd ..