Send email with log file as attachment - shell

Question

I am using Hadoop (CDH 5.4.8) to process the unstructured data and after successful processing I want to send a mail notification to the concerned team with log file as attachment.
CDH 5.4.8 Oozie does not support attachment feature in email action. So I want to do this using shell script. Please let me know the best way to do this.

Answer 1

You can easily send an email from within a shell by piping a complete mail message (header and body) into sendmail. This assumes that the host you're doing this is properly configured with a mail transfer agent (e.g. sendmail or postfix) to send email messages.
The easiest way to send email with an attachment is to create a simple template message in your mail user agent (e.g. Thunderbird), and copy its contents as a template with the view source command. Modify that template to suit your needs and place it in the shell script.
Here is an example:
#!/bin/sh
cat <<\EOF |
To: Ramesh <ramesh#example.com>
From: Diomidis Spinellis <dds#aueb.gr>
Subject: Here are your Hadoop results
Message-ID: <5700BF28.2070500#aueb.gr>
Date: Sun, 3 Apr 2016 09:58:48 +0300
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="------------030303090406090809090501"
This is a multi-part message in MIME format.
--------------030303090406090809090501
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
The attachment contains your Hadoop results.
--------------030303090406090809090501
Content-Type: application/octet-stream;
name="data"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="data"
HviDNR105+2Tr0+0fsx3OyzNueQqPuAXl9IUrafOi7Y=
--------------030303090406090809090501--
EOF
sendmail ramesh#example.com
To configure a fixed message with actual data, replace the parts you want to modify with commands that generate them. (Note the missing backslash from the here document EOF marker.)
#!/bin/sh
cat <<EOF |
To: Ramesh <ramesh#example.com>
From: Diomidis Spinellis <dds#aueb.gr>
Subject: Here are your Hadoop results
Message-ID: <5700BF28.2070500#aueb.gr>
Date: $(date -R)
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="------------030303090406090809090501"
This is a multi-part message in MIME format.
--------------030303090406090809090501
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
The attachment contains your Hadoop results.
--------------030303090406090809090501
Content-Type: application/octet-stream;
name="data"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename="data"
$(base64 binary-data-file.dat)
--------------030303090406090809090501--
EOF
sendmail ramesh#example.com