#### 2.4.2.4. Examining Build History Information

You can examine build history output from the command line or from a web interface.

To see any changes that have occurred (assuming you have `BUILDHISTORY_COMMIT = "1"`), you can simply use any Git command that allows you to view the history of a repository. Here is one method:

          $ git log -p

You need to realize, however, that this method does show changes that are not significant (e.g. a package's size changing by a few bytes).

A command-line tool called `buildhistory-diff` does exist though that queries the Git repository and prints just the differences that might be significant in human-readable form. Here is an example:

         $ ~/poky/poky/scripts/buildhistory-diff . HEAD^
         Changes to images/qemux86_64/eglibc/core-image-minimal (files-in-image.txt):
            /etc/anotherpkg.conf was added
            /sbin/anotherpkg was added
            * (installed-package-names.txt):
            *   anotherpkg was added
         Changes to images/qemux86_64/eglibc/core-image-minimal (installed-package-names.txt):
            anotherpkg was added
         packages/qemux86_64-poky-linux/v86d: PACKAGES: added "v86d-extras"
            * PR changed from "r0" to "r1"
            * PV changed from "0.1.10" to "0.1.12"
         packages/qemux86_64-poky-linux/v86d/v86d: PKGSIZE changed from 110579 to 144381 (+30%)
            * PR changed from "r0" to "r1"
            * PV changed from "0.1.10" to "0.1.12"

To see changes to the build history using a web interface, follow the instruction in the `README` file here. http://git.yoctoproject.org/cgit/cgit.cgi/buildhistory-web/.

Here is a sample screenshot of the interface: