UNIX for Dummies Questions & Answers

Capture_EmailID()
{
 echo -e "Please Enter email id, Incase you want to enter for muliple email id's please enter all separated by ',' in a single line like below"
 echo -e "abc@app.com,def@app.com"
 echo -e "\033[0;36mEnter the email id/ids \033[0;37m"
 read MAIL_ID
 Validate_Email "$MAIL_ID"
 echo -e "Email Validation Completes, Reports will be send to - \033[0;32m$MAIL_ID\033[0;37m"
}
Validate_Email()
{
echo $1 | awk -F',' '{for(c=1;c<=NF;c++) print $c}' | while read line
do
 nocomma_error_count=$(echo $line | sed 's/com/com\n/g' | grep -c com)
 if [ "$nocomma_error_count" -ge 2 ] ; then
  echo -e "\033[0;31mERROR ::: NOT VALID EMAIL ID - $line having  $error_count email id's not separated by comma (,) \033[0;37m" 
  Capture_EmailID 
 else
   format_error_count=$(echo $line | grep "^[a-zA-Z0-9.]*@app.com$")
   [ "$format_error_count" == "" ] && echo -e "\033[0;31mERROR ::: NOT VALID EMAIL ID $line\033[0;37m" && Capture_EmailID
 fi
done
}

$Capture_EmailID
Please Enter email id, Incase you want to enter for muliple email id's please enter all separated by ',' in a single line like below
abc@app.com,def@app.com
Enter the email id/ids
abc@app.com,def@app.comabc@app.com
ERROR ::: NOT VALID EMAIL ID - def@app.comabc@app.com having   email id's not separated by comma (,)
Please Enter email id, Incase you want to enter for muliple email id's please enter all separated by ',' in a single line like below
abc@app.com,def@app.com
Enter the email id/ids
Email Validation Completes, Reports will be send to -
Email Validation Completes, Reports will be send to - abc@app.com,def@app.comabc@app.com
$

awk -F"@" 'BEGIN{RS=","}{gsub(/^ +| +$/,"")}{if (!($2 ~ /^app.com *$/) || ($1 ~ "[@ ]")) f++};END{rc=(f)?"1":"0";exit rc}'