字符串转十六进制小工具

行命令小工具，效果如下例： Williams-MacBook-Pro-2:Desktop william$ ./convert usage: ./convert example: ./convert "d787108d040f4e838d04dff28e95ea30" Williams-MacBook-Pro-2:Desktop william$ ./convert "d787108d040f4e838d04dff28e95ea30" 64 37 38 37 31 30 38 64 30 34 30 66 34 65 38 3