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並前往https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash/806923

How do I test if a variable is a number in Bash? - Stack Overflow

One approach is to use a regular expression, like so: re='^[0-9]+$' if ! [[ $yournumber =~ $re ]] ; then echo "error: Not a number" >&2; exit 1 fi.

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