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man newgrp, which of man7.org/linux/man-pages/man1/newgrp.1.html and man7.org/linux/man-pages/man1/newgrp.1p.html would have been the version of the manpage you were expecting to see?man newgrpwill document thenewgrpon your system.man manwill tell you about manpage sections (the difference between.1and.1p).