Check SMART status on MacOS and pop up alert So I don't know much about bash scripting.  I am just a beginner.  I made this script which checks the SMART status of my root volume and if it is failing then it immediately throws a pop up alert if my drive is failing.
Here's the code:

A=$( diskutil info disk0 | grep SMART )

if [ "$A" != "   SMART Status:             Verified" ]
then

osascript -e 'tell application "Finder" to activate' -e 'tell 
application "Finder" to display dialog "Your Drive is failing, 
Please backup all your important files now" buttons 
{"OK"} with icon stop'
fi


I know this is so simple. Do you have any suggestions to improve it?
Some suggestions:


A direct string comparison test may be flaky especially if the string contains multiple space characters. I can think of three alternatives:


Use regex matching: this can be achieved by the =~ operator inside [[ ]]: if [[ ! "$A" =~ Verified ]].
Use awk:

A=$(diskutil info disk0 | awk '/SMART Status:/{print $NF}')
if [ "$A" != 'Verified' ]
# ...

Check exit status instead of output:

if sudo smartctl -H -q silent /dev/disk0
# ...


Use more descriptive names: smart_status_text is more self-evident than A.
Properly format your code: indent the commands inside the if block and don't leave a blank line after then.