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Issue description

at step 6 the script never sends the message to the student, as when there are changes in the filesystem the error code of /sbin/aide --check is 4, not 0, hence the AND never passes. 

aide check with no differences returns 0 (true)
aide check with differences returns 4 (false)

Steps to reproduce:

I added an "echo" to the script to better visualize the behavior of the cronjob command:

Notice how the AND never shows the echo "Email was sent"output:

It does with an OR{}:

Workaround:

The AND in the cronjob:

/sbin/aide --check && /root/aide_mon.sh

 Should be an OR: 

/sbin/aide --check|| & /root/aide_mon.sh