You are getting many errors:
1 & 2 errors are because of permission to not read the file. You can confirm the same by using command:
$ ls -lrht or $ ll
3 error because you are using the wrong command. The correct command should be:
$ adduser -G dezyre_group dezyre_user
4 error because, hdfs permission for cloudera user are always limited to /user/cloudera. You can create any folder inside the /user/cloudera. You are trying to create folder in the root structure.
Correct command would be; $ hadoop fs -mkdir dezyre or $ hadoop fs -mkdir /user/cloudera/dezyre
Hope this helps.