$ cat >> $HGRCPATH <<EOF

  > [extensions]

  > rebase=

  > 

  > [phases]

  > publish=False

  > 

  > [alias]

  > tglog = log -G --template "{rev}: '{desc}' {branches}\n"

  > EOF

  $ hg init a

  $ cd a

  $ echo c1 > c1

  $ hg ci -Am c1

  adding c1

  $ echo c2 > c2

  $ hg ci -Am c2

  adding c2

  $ echo l1 > l1

  $ hg ci -Am l1

  adding l1

  $ hg up -q -C 1

  $ echo r1 > r1

  $ hg ci -Am r1

  adding r1

  created new head

  $ echo r2 > r2

  $ hg ci -Am r2

  adding r2

  $ hg tglog

  @  4: 'r2'

  |

  o  3: 'r1'

  |

  | o  2: 'l1'

  |/

  o  1: 'c2'

  |

  o  0: 'c1'

Rebase with no arguments - single revision in source branch:

  $ hg up -q -C 2

  $ hg rebase

  rebasing 2:87c180a611f2 "l1"

  $ hg tglog

  @  4: 'l1'

  |

  o  3: 'r2'

  |

  o  2: 'r1'

  |

  o  1: 'c2'

  |

  o  0: 'c1'

  $ cd ..

  $ hg init b

  $ cd b

  $ echo c1 > c1

  $ hg ci -Am c1

  adding c1

  $ echo c2 > c2

  $ hg ci -Am c2

  adding c2

  $ echo l1 > l1

  $ hg ci -Am l1

  adding l1

  $ echo l2 > l2

  $ hg ci -Am l2

  adding l2

  $ hg up -q -C 1

  $ echo r1 > r1

  $ hg ci -Am r1

  adding r1

  created new head

  $ hg tglog

  @  4: 'r1'

  |

  | o  3: 'l2'

  | |

  | o  2: 'l1'

  |/

  o  1: 'c2'

  |

  o  0: 'c1'

Rebase with no arguments - single revision in target branch:

  $ hg up -q -C 3

  $ hg rebase

  rebasing 2:87c180a611f2 "l1"

  rebasing 3:1ac923b736ef "l2"

  $ hg tglog

  @  4: 'l2'

  |

  o  3: 'l1'

  |

  o  2: 'r1'

  |

  o  1: 'c2'

  |

  o  0: 'c1'

  $ cd ..