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並前往https://stackoverflow.com/questions/6348902/how-can-i-add-numbers-in-a-bash-script

How can I add numbers in a Bash script? - Stack Overflow

Use arithmetic expansion: $((EXPR)) num=$((num1 + num2)) num=$(($num1 + $num2)) # Also works num=$((num1 + 2 + 3)) # ... num=$[num1+num2] # Old, deprecated ...

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