Validate Emails with Bash - bash

Question

I try to validate an email with a shell script. Is there a easy example to validate a mail? Asked google but just found crap and PHP (also crap..).
Thanks and regards.

Answer 1

If you explicitly state bash on the #! line, you can uses regexes:
#!/bin/bash
if [[ $email =~ '(.+)#(.+)' ]] ; then
user=${BASH_REMATCH[1]}
host=${BASH_REMATCH[2]}
fi
If you are serious about programing with bash, read the man page all the way through. Twice. Also read the Bash FAQ.

Answer 2

Validate script.
The meaning of this script, is to be sure from all emails that are valid or not before sending them email.
this script check a list of emails.
#!/bin/bash
#:
#: e-mail.verify.sh
#:
#: Date: 2011/14/12 13:14 PM IST
#: Author: Louay _at_ louie.msh#gmail.com
#: Discription: Verify (or) Validate the Hotmail Adresses.
#:
#:
#: First we create a Expect script to be sourced for us.
if [ ! $# == 1 ]
then
echo "Invalid Args $0 Filename"
exit 0
fi
#: Verifying the Hotmail adressess.
#: First verify the network Connections
C_R="\e[01;31m" ## Colors
C_B="\e[01;30m"
C_G="\e[01;32m"
C_END="\e[00m"
SMTPSERV=`host -t mx hotmail.com |grep 5 | grep mx2.hotmail.com |cut -d " " -f 7| sed 's/\.$//'`
ping -c2 $SMTPSERV >/dev/null
if [ "$?" -eq 0 ]
then
echo -e "Internet Connection" "\t\t\t\t\t\t$C_G[ OK ]$C_END"
echo -e "$SMTPSERV is AVAILABLE."
echo -n "Verifing"
for (( i=0; i<5; i++ ))
do
echo -n ".."
sleep 1
done
echo
else
echo -e "Internet Connection:" "\t\t\t\t\t\t$C_R[ FAIL ]$C_END" ""
echo -e "$SMTPSERV is Unavialable."
echo -e "Check your Network settings."
exit 0
fi
COUNT=0
RM_FILE="validemails.txt"
rm -f $RM_FILE
cat $1 | while read LINE; do
{
MAFR="MAIL FROM: <louie.msh#gmail.COM>"
MATO="RCPT TO: <$LINE>"
#: ^variablies declared for not get escaped in the next cat command, where
#: we set the $MAFR in the expect script.
cat << __EOF > e-veri
#!/bin/expect
#:
#: Date: 2011/14/12 01:14 PM
#: Author: Louay Mshelim_at_ louie.msh#gmail.com
#: Discription: Expect Script to Verify/Validate the Hotmail Adresses.
#:
set VMAFR "$MAFR"
set VMATO "$MATO"
spawn nc -C mx4.hotmail.com 25
expect "Sending"
send "HELO mx4.hotmail.com\r"
expect "OK"
send "\$VMAFR\r"
expect "OK"
send "\$VMATO\r"
expect "250"
send "quit\r"
expect eof
__EOF
#: Running the expect script and extracting the Results.txt
expect e-veri > Results.txt
grep 550 Results.txt >/dev/null
if [ "$?" -eq 0 ]
then
echo -e $LINE >> invalid.txt #invalid E-mails
else
echo -e "$LINE" >> validemails.txt
fi
}
done
echo -e "Valid E-mail have been saved to $C_R[ validemails.txt ]$C_END"
#: END

Answer 3

Here is an improved and working version of the script by codevour:
#!/bin/bash
# check for valid usage
if [ x$1 = 'x' ]
then
echo "Usage: $0 <email address>"
exit 1
fi
mailcmd=`mktemp`
# grabbing fields
user=`echo $1 | perl -p -e 's/^([^#]+)#([^\#]+)$/$1/g'`
host=`echo $1 | perl -p -e 's/^([^#]+)#([^\#]+)$/$2/g'`
mxhost=`host -t mx $host|perl -p -e 's/.* ([^ ]+)\.$/$1/g'|sort -R|tail -1`
# compose email commands
echo -ne "helo example.com\r\n" > $mailcmd
echo -ne "mail from: <tester#example.com>\r\n" >> $mailcmd
echo -ne "rcpt to: <$1>\r\n" >> $mailcmd
echo -ne "quit\r\n" >> $mailcmd
# check for mail results
mailresult=`cat $mailcmd | nc $mxhost 25| grep ^550 | wc -c`
if [ $mailresult -eq 0 ]
then
echo $1 "is valid"
exit 0
else
echo $1 "is not valid"
exit 1
fi
# clean up
rm $mailcmd

Answer 4

You mean something like this?
#!/bin/bash
# check for valid usage
if [ x$1 = 'x' ]
then
echo "Usage: $0 <email address>"
exit 1
fi
# grabbing fields
user=`echo $1 | cut -f1 -d\#`
host=`echo $1 | cut -f2 -d\#`
mxhost=`host -t mx $host | cut -f7 -d\ `
len=`echo $mxhost | wc -c`
len=`expr $len - 2`
mxhost=`echo $mxhost | cut -b1 -$len`
# compose email commands
echo -ne "helo test.com\r\n" > mailcmd
echo -ne "mail from: test\#test.com\r\n" >> mailcmd
echo -ne "rcpt to: $1\r\n" >> mailcmd
echo -ne "quit\r\n" >> mailcmd
# check for mail results
mailresult=`cat mailcmd | nc $mxhost 25| grep ^550 | wc -c`
if [ $mailresult -eq 0 ]
then
echo $1 "is valid"
exit 0
else
echo $1 "is not valid"
exit 1
fi
# clean up
rm mailcmd
Found at:
Fun things in Life - Simple Bash Email Validator

Answer 5

My any suggestion for the latter script, check work with multiple servers that accept checks without authentication, using nslookup who knows:
For example code in:
http://www.vivaolinux.com.br/script/Simples-Verificador-de-Email-Gmail
see the code below in the site.
I hope I have contributed and I hope to collaborate as well.
Thank you.

Answer 6

You can use like this,
read emailId
if echo "${emailId}" | grep '^[a-zA-Z0-9]*#[a-zA-Z0-9]*\.[a-zA-Z0-9]*$' >/dev/null; then
echo Valid
else
echo Not Valid
fi