Shell Programming and Scripting

#!/usr/bin/ksh
echo "This is a test mailest mail" | /usr/lib/sendmail -f abc.xyz@family.org xyz.abc@family.org

  (
    echo "To: $1"
    echo "From: $2"
    echo "Subject: $3"
    echo "$4"                    ***
  ) | /PATH-TO/sendmail -t

  (
    echo "To: $mailto"
    echo "From: $from"
    echo "Subject: $subject"
    echo "$body"
  )  |  /PATH-TO/sendmail -t

#!/usr/bin/ksh
  (
    echo "To: $mailto"
    echo "From: $from"
    echo "Subject: $subject"
    echo "$body"
  )  |  /usr/lib/sendmail -t

#!/usr/bin/ksh
mailto=$1
from=$2
subject=$3
body=$4

  (
    echo "To: $mailto"
    echo "From: $from"
    echo "Subject: $subject"
    echo "$body"
  )  |  /usr/lib/sendmail -t

#/usr/bin/sh
subject=$1;
body=$2;
from=$3;
to=$4;
cc=$5;
sendmail_path="/usr/lib/sendmail";
send=`echo $subject| $body | $sendmail_path -f $from -t $to`;
echo $send is the return code;