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Full Discussion: Cron shell script not executing diskutil command
Top Forums UNIX for Dummies Questions & Answers Cron shell script not executing diskutil command Post 302766823 by illuminate on Tuesday 5th of February 2013 01:09:41 PM
Old 02-05-2013
Code Cron shell script not executing diskutil command
I'm trying to learn how to use cron for repetative tasks. I have an external disk that needs to be unmounted and remounted every hour due to some problems that a backup utility (specifically, TimeMachine) is having repeatedly accessing the device. I've created a shell script that will find the mount point of the drive, unmount it, and then remount it. Here's the code:
Code:
#!/bin/sh

# Finds the device node of the drive 'Rebel Base', and saves it to variable i
export i=`diskutil info 'Rebel Base' | grep 'Device Node' | cut -d : -f 2 | sed 's/^ *//g' | sed 's/ *$//g';`
# unmounts device found at variable i
hdiutil unmount -force $i
sleep 1
# remounts device found at variable i
hdiutil mountvol $i

When I run this as a shell script, it works just fine. However, cron returns the following error:

line 4: diskutil: command not found
hdiutil: unmount: no file specified
Usage: hdiutil unmount [options] <mountpoint>
hdiutil unmount -help
hdiutil: mountvol: no device specified
Usage: hdiutil mountvol [options] <devname>
hdiutil mountvol -help

My cron looks like this:

Code:
* 9-16 * * 1-5 sh /Users/danielmarcus/Dropbox/programming/relaunchRebel.sh

What am I doing wrong here? Any and all help is very much appreciated.
 

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LEARN ABOUT FREEBSD

automount

AUTOMOUNT(8)						    BSD System Manager's Manual 					      AUTOMOUNT(8)

NAME

     automount -- update autofs mounts

SYNOPSIS

     automount [-D name=value] [-L] [-c] [-f] [-o options] [-v] [-u]

DESCRIPTION

     When called without options, the automount command parses the auto_master(5) configuration file and any direct maps that it references, and
     mounts or unmounts autofs(4) filesystems to match.  These options are available:

     -D  Define a variable.  It is only useful with -L.

     -L  Do not mount or unmount anything.  Instead parse auto_master(5) and any direct maps, then print them to standard output.  When specified
	 more than once, all the maps, including indirect ones, will be parsed and shown.  This is useful when debugging configuration problems.

     -c  Flush caches, discarding possibly stale information obtained from maps and directory services.

     -f  Force unmount, to be used with -u.

     -o  Specify mount options to be used along with the ones specified in the maps.  It is only useful with -L.

     -u  Try to unmount filesystems mounted by automountd(8).  autofs(5) mounts are not unmounted.  To unmount all autofs mounts, use umount -At
	 autofs.

     -v  Increase verbosity.

EXIT STATUS

     The automount utility exits 0 on success, and >0 if an error occurs.

EXAMPLES

     Unmount all filesystems mounted by automountd(8):
	   automount -u

SEE ALSO

     auto_master(5), autofs(5), automountd(8), autounmountd(8)

HISTORY

     The automount command appeared in FreeBSD 10.1.

AUTHORS

     The automount was developed by Edward Tomasz Napierala <trasz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.

BSD
								 November 22, 2014							       BSD
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