Specifying revisions

Revision identifiers and ranges

Breezy has a very expressive way to specify a revision or a range of revisions. To specify a range of revisions, the upper and lower bounds are separated by the .. symbol. For example:

$ brz log -r 1..4

You can omit one bound like:

$ brz log -r 1..
$ brz log -r ..4

Some commands take only one revision, not a range. For example:

$ brz cat -r 42 foo.c

In other cases, a range is required but you want the length of the range to be one. For commands where this is relevant, the -c option is used like this:

$ brz diff -c 42

Available revision identifiers

The revision, or the bounds of the range, can be given using different format specifications as shown below.

argument type



revision number


revision number


negative revision number


globally unique revision id


globally unique revision id


leftmost parent of ‘’rev’’


first entry after a given date


first entry after a given date


revision matching a given tag


revision matching a given tag


last merged revision from a branch


latest revision on another branch


common ancestor with submit branch

A brief introduction to some of these formats is given below. For complete details, see Revision Identifiers in the Breezy User Reference.


Positive numbers denote revision numbers in the current branch. Revision numbers are labelled as “revno” in the output of brz log. To display the log for the first ten revisions:

$ brz log -r ..10

Negative numbers count from the latest revision, -1 is the last committed revision.

To display the log for the last ten revisions:

$ brz log -r -10..


revid allows specifying an internal revision ID, as shown by brz log --show-ids and some other commands.

For example:

$ brz log -r revid:Matthieu.Moy@imag.fr-20051026185030-93c7cad63ee570df



‘’rev’’ specifies the leftmost parent of ‘’rev’’, that is the revision that appears before ‘’rev’’ in the revision history, or the revision that was current when ‘’rev’’ was committed.

‘’rev’’ can be any revision specifier and may be chained.

For example:

$ brz log -r before:before:4
revno: 2



‘’value’’ matches the first history entry after a given date, either at midnight or at a specified time.

Legal values are:

  • yesterday

  • today

  • tomorrow

  • A YYYY-MM-DD format date.

  • A YYYY-MM-DD,HH:MM:SS format date/time, seconds are optional (note the comma)

The proper way of saying “give me all the log entries for today” is:

$ brz log -r date:yesterday..date:today



specifies the common ancestor between the current branch and a different branch. This is the same ancestor that would be used for merging purposes.

path may be the URL of a remote branch, or the file path to a local branch.

For example, to see what changes were made on a branch since it was forked off ../parent:

$ brz diff -r ancestor:../parent



path specifies the latest revision in another branch.

path may be the URL of a remote branch, or the file path to a local branch.

For example, to get the differences between this and another branch:

$ brz diff -r branch:http://example.com/brz/foo.dev