Shell Programming and Scripting

for i in `cat list`
do
  id $i > /dev/null
  if [ `echo $?` -eq 0 ]; then
    echo "ID $i exists"
  elif [ `echo $?` -eq 1 ]; then
    echo "$i Does not exist" 
  else
    echo "Error"
  fi
done

$>sh chk.sh

User not found in /etc/passwd file    # <== Now this message is the default error message
                                      # through the command "id $i". I don't want to see this on terminal.
isctm91 Does not exist                # <== I just want to see this message.
User not found in /etc/passwd file    # <== this message don't want to see on terminal
iscts30 Does not exist                # <==I just wzant to see this message.

cat list | while read i
do
    id $i 1>/dev/null 2>/dev/null ; ERROR=$?
    if [ ${ERROR} -eq 0 ]
    then
         echo "ID $i exists"
    else
         echo "$i Does not exist" 
    fi
done

while read i
do
    if id $i >/dev/null 2>&1
    then
         echo "ID $i exists"
    else
         echo "$i Does not exist" 
    fi
done < list