Given this line in your output "(CRON) info (No MTA installed, discarding
output)" that means cron is having a problem with your script but because
you don't have an MTA installed it can't email you the output to tell you
what failed.

I would guess you probably have a PATH issue.
http://askubuntu.com/questions/23009/reasons-why-crontab-does-not-work


-- Daniel R. <[email protected]> [http://danielr.neophi.com/]


On Thu, Jul 18, 2013 at 5:59 PM, <[email protected]> wrote:

> I'm having one of those days. I have created some Grunt scripts to do some
> build work. I have created the first script to do a JSHint check on JS
> files in the repo, and then send an email with the errors. Works great -
> I'm using grunt with jshint, and that module has an escape to call a custom
> formatter for the JSHint errors, also written in javascript. I'm using
> Amazon SES to send the emails.
>
> All works fine in practice, but it will not run in CRON. I can see the
> cron jobs starting in the CRON jobs. No errors. I can run the commands from
> the command line, no errors - works beautifully. I can run other cron jobs
> that dump data out to /tmp, no problem. But no output comes out of the
> Grunt job.
>
> So I took the formatter out, and ran it as a plain node.js job. Works
> fine. But again, it does nothing as a CRON job. I have stripped out
> everything, except for the part where it sends an email, and I'm just
> sending hard coded text with a hard coded email address. Will run again
> from the command line, so permissions are fine, but when I try to run as
> CRON, nothing happens.
>
> Any suggestions. I have been up and down the permissions check. I have
> change the files and the directory where they work over to allow anything.
> Still nothing. I created the crontab entry with crontab -e, so it is
> running in the same user, (ubuntu,) that owns the directories and files.
>
> Running on Ubuntu 12.04. I'm stumped. Any ideas? I have set it up to run
> every minute.
>
> Here's the crontab line:
> */1 * * * *  sh /var/test/trunk/build/batch_jshint.sh
>
> The cron logs:
> Jul 18 21:57:01 ip-10-251-25-8 CRON[2561]: (ubuntu) CMD (sh
> /var/test/trunk/build/batch_jshint.sh)
> Jul 18 21:57:01 ip-10-251-25-8 CRON[2562]: (ubuntu) CMD (sh
> /var/test/trunk/build/test.sh)
> Jul 18 21:57:01 ip-10-251-25-8 CRON[2563]: (ubuntu) CMD (/usr/bin/uptime >
> /tmp/uptime)
> Jul 18 21:57:01 ip-10-251-25-8 CRON[2560]: (CRON) info (No MTA installed,
> discarding output)
> Jul 18 21:58:01 ip-10-251-25-8 CRON[2581]: (ubuntu) CMD (sh
> /var/test/trunk/build/batch_jshint.sh)
> Jul 18 21:58:01 ip-10-251-25-8 CRON[2582]: (ubuntu) CMD (sh
> /var/test/trunk/build/test.sh)
> Jul 18 21:58:01 ip-10-251-25-8 CRON[2583]: (ubuntu) CMD (/usr/bin/uptime >
> /tmp/uptime)
> Jul 18 21:58:01 ip-10-251-25-8 CRON[2580]: (CRON) info (No MTA installed,
> discarding output)
>
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