I have two variables that are set by a number i.e.
recs_on_db=12
yesterdays_recs_on_db=10
i need to get the difference between the two and be able to set this in a variable
I have tried expr but does not work:
db_difference=`expr $recs_on_db - $yesterdays_recs_on_db`
i get:
expr: syntax error
i want it to set variable $db_difference with the difference
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