Date: Wed, 01 Oct 2008 16:48:35 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Steve Bertrand <steve@ibctech.ca> Cc: freebsd-questions@freebsd.org Subject: Re: Using global environment variables inside a subshell Message-ID: <44hc7wqbx8.fsf@be-well.ilk.org> In-Reply-To: <48E380C4.4090304@ibctech.ca> (Steve Bertrand's message of "Wed\, 01 Oct 2008 09\:53\:08 -0400") References: <48E380C4.4090304@ibctech.ca>
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Steve Bertrand <steve@ibctech.ca> writes:
> I've fudged together a quick disk space monitor that I will run from
> cron. Running the script works fine from the command line, but when I
> run it from cron, the environment variable is empty.
>
> Can someone point out the err of my ways?:
>
> #!/bin/sh
>
> /bin/df | \
> /usr/bin/awk '{if($5 ~ "%" && $6 !~ "proc") {used=$5} else {used=""}; \
> sub(/%/, "", used); \
> if(used > 95) print $6 " is at " used"% on "ENVIRON["HOSTNAME"]"!"}' | \
> mail -s "Disk usage action required" email@addr.com
The environment under which cron jobs are run is very spare. It's
more or less limited to the variables that are listed in the
crontab(5) manual. You need to get the value into your script another
way. In this case, I would use hostname(1).
--
Lowell Gilbert, embedded/networking software engineer, Boston area
http://be-well.ilk.org/~lowell/
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