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(cherry picked from commit cbd31328a61252f253aa2bcdb9cad70f7876d231) Conflicts: hadoop-common-project/hadoop-common/src/site/markdown/CommandsManual.md hadoop-common-project/hadoop-common/src/site/markdown/UnixShellGuide.md (cherry picked from commit 722182fdfbb654be655fbca42f34bba5a05c2f6d)