You can issue below command from a command line on your development machine to print a list of supported adb commands and their descriptions.

adb help

If you want to check the newest reference, click adb commands reference.

Version Publish Date Download
1.0.40 2018 [Download]
1.0.39 2017-06 [Download]
1.0.38 2017-02 [Download]
1.0.37 2016-11 [Download]
1.0.36 2016-05 [Download]
1.0.35 2016-04 [Download]
1.0.34 2015-11 [Download]
1.0.33 2015-09 [Download]
1.0.32 2015-09 [Download]
1.0.31 2014-06 [Download]
1.0.30 2012-08 [Download]