$ echo "[extensions]" >> $HGRCPATH

  $ echo "mq=" >> $HGRCPATH

  $ hg init

  $ echo qqq>qqq.txt

rollback dry run without rollback information

  $ hg rollback

  no rollback information available

  [1]

add file

  $ hg add

  adding qqq.txt

commit first revision

  $ hg ci -m 1

set bookmark

  $ hg book test

  $ echo www>>qqq.txt

commit second revision

  $ hg ci -m 2

set bookmark

  $ hg book test2

update to -2 (deactivates the active bookmark)

  $ hg update -r -2

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

  (leaving bookmark test2)

  $ echo eee>>qqq.txt

commit new head

  $ hg ci -m 3

  created new head

bookmarks updated?

  $ hg book

     test                      1:25e1ee7a0081

     test2                     1:25e1ee7a0081

strip to revision 1

  $ hg strip 1

  saved backup bundle to $TESTTMP/.hg/strip-backup/*-backup.hg (glob)

list bookmarks

  $ hg book

     test                      0:5c9ad3787638

     test2                     0:5c9ad3787638