https://unix.stackexchange.com/questions/55069/how-to-add-arithmetic-variables-in-a-script
#!/bin/bash foo=10 bar=3 result=`expr $foo + $bar` echo "$result"
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https://unix.stackexchange.com/questions/55069/how-to-add-arithmetic-variables-in-a-script
#!/bin/bash foo=10 bar=3 result=`expr $foo + $bar` echo "$result"