add user and create group LINUX

#Assignment noA3
Roll no:
Batch  :
ch=1
  while [ $ch  -eq 1 ]
  do 
    echo "1.Add user"
    echo "2.Add group "
    echo "3.adding user to group "
    echo "4.check the content of group "
    echo "5.check the info of user"
    echo "6.change owner"
    echo "7.change group"
    echo "plz enter u r choice"
    read no