Shell script to validate numeric ID and email in CSV file

id_and_email_validation.sh

# The purpose of this script is to validate CSV file containing two columns,
# ID and email. ID is an integer, email can be quoted.
# It will catch inconsistent quotation marks, invalid emails and ID that is not numberic.
# Valid line examples:
# 1234567890;'email@address.com'
# 1234567890;"email@address.com"
# 1234567890;email@address.com

#!/usr/bin/env sh

input_file=$1
line_number=0
red='\e[31m'
green='\e[92m'
red_background='\e[41m'
blue_background='\e[44m'
end_color='\e[0m'
terminate=false

input_file=$1

if [ ! $1 ];then echo "Please enter input file" && exit ; fi

for line in $(cat $input_file); do
 let line_number+=1
 email="$(echo $line | awk -F ';' '{print $2}')"
 cmn_authentication_id="$(echo $line | awk -F ';' '{print $1}')"
 # Basic user id validation
 if [ $(echo $cmn_authentication_id | egrep -v "^[0-9]+[0-9]$") ]; then
  echo -e "Line $line_number: Invalid user id [$red_background $cmn_authentication_id $end_color]"
  terminate=true
 else
  val_cmn_authentication_id=$green"OK"$end_color
 fi
 # Basic email validation
 if [ $(echo $email | egrep "^('|\")?..+@..+\..+('|\")?$") ]; then
  val_email=$green"OK"$end_color
 else
  echo -e "Line $line_number: Invalid email [$red_background $email $end_color]"
  terminate=true
 fi
 if [ $(echo $email | egrep "^\"") ]; then
     echo -en "."
     if [ ! $(echo $email | egrep  "\"$") ] || [ $(echo $email | egrep -o '"' | wc -l) -ne 2 ] || [ $(echo $email | egrep "'") ]; then
         email="$red_background $email $end_color"
         terminate=true
     fi
 fi
 if [ $(echo $email | egrep "^'") ]; then
     echo -en "."
     if [ ! $(echo $email | egrep "'$") ] || [ $(echo $email | egrep -o "'" | wc -l) -ne 2 ] || [ $(echo $email | egrep "\"") ]; then
         email="$red_background $email $end_color"
         terminate=true
     fi
  fi
 if [ $(echo $email | egrep -v "^('|\"){1}") ]; then
     echo -en "."
     if [ $(echo $email | egrep  "('|\"){1}$") ]; then
         echo -en "."
         email="$red_background $email $end_color"
         terminate=true
     fi
 fi
  echo -e "$cmn_authentication_id $val_cmn_authentication_id => $email $val_email"
  if [ $terminate = true ];then echo "Last line read: $line_number" && exit;fi
done