system sh/stop_dnodes.sh
system sh/deploy.sh -n dnode1 -i 1
system sh/exec.sh -n dnode1 -s start
sql connect

print ============= step1
sql create user u_read pass 'taosdata1' host '127.0.0.1/24','192.168.1.0/24'
sql create user u_write pass 'taosdata1' host '127.0.0.1','192.168.1.0'

sql alter user u_read add host '3.3.3.4/24'
sql_error alter user u_write drop host '4.4.4.5/25'

sql show users
if $rows != 3 then 
  return -1
endi

print ============= step2
sql_error create user read1 pass 'taosdata1' host '127.0.0/24'
sql_error create user write1 pass 'taosdata1' host '4.4.4.4/33' 

sql show users
if $rows != 3 then 
  return -1
endi


system sh/exec.sh -n dnode1 -s stop -x SIGINT