判断变量是全数字

 

test_num.sh

 

#!/bin/sh file_size=128 input_num="$(echo "$1" | sed -n "/^[0-9]/+$/p")" if [ -n "$input_num" ];then echo "Input is the number!" file_size="$1" echo "file_size = $file_size" else echo "Input isn't the number!" echo "Use defaule size $file_size." fi