some

ops4j-release-github

First make sure you prepare your environment http://wiki.ops4j.org/display/ops4j/Releasing.

Use Maven 3.

mvn -Prelease,repos.sonatype.staging -Darguments="-Prelease,repos.sonatype.staging" release:prepare

mvn -Prelease,repos.sonatype.staging -Darguments="-Prelease,repos.sonatype.staging" release:perform -Dgoals=deploy -DconnectionUrl=scm:git:file:///Users/tonit/devel/oss/org.ops4j.pax.exam1/

Hint: 
1. the -DconnectionUrl is a workaround for bug http://jira.codehaus.org/browse/MRELEASE-605
when using pushChanges=false in maven release plugin configuration.

2. -Dgoals=deploy prevent maven from deploying the (currently useless) maven site.

Some git cheats for rollback:
git rebase -i HEAD~3
(remove the unwanted commits and save)
git tag -d exam-1.2.3

Make sure to drop the ops4j staging repo on oss.sonatype.org (when closing fails only, of cause).