variables are used by useradd , usermod , and userdel to create, move, or delete the user ... umask as the default umask value. USERDEL_CMD (string) If defined, this commandnewusers (8), subgid (5), useradd (8), userdel (8), usermod (8), user_namespacesnewusers (8), subuid (5), useradd (8), userdel (8), usermod (8), user_namespaces