Here are my heavy used Maven2 com­mands
Build Project with­out Unit Tests:

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mvn pack­age –Dmaven.test.skip=true

Dis­play Depen­dency Tree:

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mvn dependency:tree

Down­load all Project Dependencies:

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mvn dependency:go-offline

Deploy JAR into inter­nal Repos­i­tory (Spring example):

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mvn deploy:deploy-file –DgroupId=spring –DartifactId=springframework –Dversion=1.2.9 –Dpackaging=jar –Dfile=c:tmpdistspring.jar
–DrepositoryId=YOUR-REPO –Durl=scp://cvs.YOUR.REPO.com/java/maven2/

Build Eclipse Project File:

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mvn eclipse:eclipse

Fur­ther read­ing: Pro­fes­sional Java Tools for Extreme Pro­gram­ming: Ant, XDo­clet, JUnit, Cac­tus, and Maven (Pro­gram­mer to Programmer)