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If you do not declare a PATH variable in your script or crontab then the PATH will be

/usr/bin:/bin

hdiutil manipulates disk images. It will unmount attached file systems but you should be...

Get the PATH to hdiutil:
type hdiutil
which hdiutil
and set that at the beginning of your script:
#!/bin/sh
export PATH
PATH=/bin:/usr/bin:/sbin:/usr/sbin:/path/to/hdiutil
...