I am trying to run a for loop which looks something like this

cat  all_data |
  awk '{print $1 " "$2" " $3}'  |
  while read inst type serial ; do
    echo $inst
    if [ `echo ${inst} | cut -d '-' -f2` = H3 ]; then
      ssh  -t  username@hostname1 "sudo ls"
    elif [ `echo ${inst} | cut -d '-' -f2` = H2 ] ; then
      ssh  -t  username@hostname2 "sudo ls"
    elif [ `echo ${inst} | cut -d '-' -f2` = 1 ]; then
      ssh  -t  username@hostname1 "sudo ls"
    fi
  done

I am not able to run the ssh -t part,it says psuedo terminal will not be allocated becasued stdin is not a terminal sudo: no tty present and no askpass program specified I have tried with -t -t and -n, no luck. I cant edit the visudo file from the host i am running this command from.

###Edit cat all_data

ABC-DIF2 DELL-800 60999

ABC-DIF3 HP-DL340 J0777

ABC-DIF4 DELL-800 P0087 . . .

The all_data contains 1000's of the similar entries. What i am trying to do it as follows. 60999,J0777... are the entities on which i need to run commands on.

So i am trying to read each line, split up and check what is the DIF number corresponding to the entity. eg If i read DIF2, it means that i need to ssh into hostname2 and run the command to get data on the 60999 If if i read DIF3, it means for the entity J0777 can only be run from hostname3.

Can someone please help