how to do math in bash
# Basic syntax: # Subtraction expr 1 - 1 0 # Addition expr 1 + 1 2 # Assign result to a variable myvar=$(expr 1 + 1) echo $myvar 2 # Addition with a variable expr $myvar + 1 3 # Division expr $myvar / 3 0 # Multiplication expr $myvar \* 3 6