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Snapshot List outputs in file and email as single line

Posted March 23, 2020 343 views
DigitalOcean API and CLI (doctl)

I’m looking to develop a script where the Snapshot list is emailed to someone.

When I run doctl compute droplet snapshots $dropletid, I get the following:

ID          Name                                     Type        Distribution    Slug    Public    Min Disk
61003635    test-droplet_2020-03-22-Sun@17:34-CDT    snapshot    Ubuntu                  false     25
61004052    test-droplet_2020-03-22-Sun@17:46-CDT    snapshot    Ubuntu                  false     25
61004228    test-droplet_2020-03-22-Sun@17:52-CDT    snapshot    Ubuntu                  false     25
61005132    test-droplet_2020-03-22-Sun@18:07-CDT    snapshot    Ubuntu                  false     25
61005281    test-droplet_2020-03-22-Sun@18:11-CDT    snapshot    Ubuntu                  false     25
61007940    test-droplet_2020-03-22-Sun@19:04-CDT    snapshot    Ubuntu                  false     25

However, when I echo that to an email, with this sudo /snap/bin/doctl compute droplet snapshots $dropletid >> $email_notification, I get the following in the email:

ID Name Type Distribution Slug Public Min Disk 61003635 test-droplet_2020-03-22-Sun@17:34-CDT snapshot Ubuntu false 25 61004052 test-droplet_2020-03-22-Sun@17:46-CDT snapshot Ubuntu false 25 61004228 test-droplet_2020-03-22-Sun@17:52-CDT snapshot Ubuntu false 25 61005132 test-droplet_2020-03-22-Sun@18:07-CDT snapshot Ubuntu false 25 61005281 test-droplet_2020-03-22-Sun@18:11-CDT snapshot Ubuntu false 25 61007940 test-droplet_2020-03-22-Sun@19:04-CDT snapshot Ubuntu false 25 61008918 test-droplet_2020-03-22-Sun@19:15-CDT snapshot Ubuntu false 25

Instead of the output being on one line, I want the output to be on as many lines as being requested.

Is there something I’m missing?

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aaronmweiss
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aaronmweiss
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1 answer
bobbyiliev March 23, 2020

Hi there @aaronmweiss,

What I usually would do in this case is save the output in a file, then with send mail you could proceed that file like this:

  • sendmail email@yourdomain.com < output_file.txt

You can set your subject as the first line of the file:

Subject: Your mail subject

To save the output to a file it would look something like this:

#!/bin/bash

echo 'Subject: Your mail subject' > ~/output_file.txt

doctl compute droplet snapshots $dropletid >> ~/output_file.txt

sendmail email@yourdomain.com < ~/output_file.txt

To make things more secure rather than having a specific output file, I would recommend using the mktemp command:

#!/bin/bash

temp_output=$(mktemp /tmp/temp-output.XXXXXX)

echo 'Subject: Your mail subject' > ${temp_output}

doctl compute droplet snapshots $dropletid >> ${temp_output}

sendmail email@yourdomain.com < ${temp_output}

rm -f ${temp_output}

That way you would always have a different temp file.

Hope that this helps!
Regards,
Bobby

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