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git log -3 outputs last 3 entries.
git log -6 outputs last 6 entries.

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commit 67aba32eca6794dc89f34bde1680b5d52fcb9998
Author: Erik Smith 
Date:   Fri Aug 28 11:03:19 2015 -0400

    Adds error handling for Eventbrite.com API error responses.

 sites/default/modules/ebv3/includes/Ebv3Api.inc    | 31 +++++++++++++++++++++++--------
 sites/default/modules/ebv3/includes/Ebv3Logo.inc   |  1 +
 sites/default/modules/ebv3/includes/ebv3.admin.inc |  2 +-
 3 files changed, 25 insertions(+), 9 deletions(-)

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git log --pretty=online

17131853d65915d788483679616a8e5bfa401390 Live debugging on Dev.
1eb51c73ba7567d58036a466bd4958baac63244a Creates destination directory.
21c069a4080bac1b1932fe9f6767b6d235536816 slick adjustment
edcdc010bdda2dc9cb56f03fe08af72b6e2d294a Fixes hook_update_n() number.
a92f46584edfbae0d5d36f86a853cb6fc36c5934 Logic for retrieving logo file object data.

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git log --pretty=format:'%h - %an, %ar : %s'

062947c - Erik Smith, 23 hours ago : Adds a new column to track logo ids.
d0d0bf3 - Erik Smith, 24 hours ago : Removes short-circuit used for debugging.
3edf922 - Erik Smith, 25 hours ago : Merge branch 'feature/features-updates'
7f39ff1 - Erik Smith, 25 hours ago : Updates support feature.

Find all commits by author

git log --pretty='%h %an %ar %s' --author='Erik Smith'

1eb51c7 Erik Smith 20 hours ago Creates destination directory before allowing event import to proceed.
edcdc01 Erik Smith 21 hours ago Fixes hook_update_n() number.
00d9b2e Erik Smith 23 hours ago Adds tracking of logo id on Event creation.
062947c Erik Smith 23 hours ago Adds a new column to track logo ids.
d0d0bf3 Erik Smith 25 hours ago Removes short-circuit used for debugging.
3edf922 Erik Smith 25 hours ago Merge branch 'feature/features-updates'
7f39ff1 Erik Smith 25 hours ago Updates Eventbrite support feature.

Only show commits with a commit message containing the string

git log --pretty='%h %an %s' --author='Dries Buytaert' --grep='logo' -5

Here I have requested the last 5 commits authored by Dries Buytaert with log messages containing the string 'logo'.

a0b2c8e Dries Buytaert - Patch #972136 by tim.plunkett, starnox: site name alignment wrong with no logo.
ec97ffd Dries Buytaert - Patch #848312 by Jeff Burnz, tsi, jensimmons, tim.plunkett, aspilicious, bleen18: better Druplicon logo for Bartik.
86e806f Dries Buytaert - Patch #653234 by timmillwood: make Druplicon look inward until we figure out what to do with the logomark.
9381abb Dries Buytaert - Patch #470998 by bleen18: properly align the Druplicon logo in Garland.
4718f59 Dries Buytaert - Patch #316515 by jmburnz, momendo: fixed position of OpenID logo.

Show commits adding or removing code matching the string -S

git log -p --author='Erik Smith' -SHandleCommonErrors -1

Here I am querying for my last commit with a code change containing the string 'HandleCommonErrors'.

commit 67aba32eca6794dc89f34bde1680b5d52fcb9d6b
Author: Erik Smith 
Date:   Fri Aug 28 11:03:19 2015 -0400

    Adds error handling for Eventbrite.com API error responses.

diff --git a/sites/default/modules/ebv3/includes/Ebv3Api.inc b/sites/default/modules/ebv3/includes/Ebv3Api.inc
index 2925949..6aa702b 100644
--- a/sites/default/modules/ebv3/includes/Ebv3Api.inc
+++ b/sites/default/modules/ebv3/includes/Ebv3Api.inc
@@ -38,17 +38,27 @@ class Ebv3Api {
   public function request($request, $options = array()) {
     $result = drupal_http_request($request, $options);
-    if ($result && (int) $result->code === 200) {
+    if ($result) {
       $data = json_decode($result->data);
-      return $data;
+      if ($result->code == 200) {
+        return $data;
+      }
+      else {
+        $this->HandleCommonErrors($data);
+        return FALSE;
+      }
     }

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git log --pretty=format:'%h - %an %s' --graph