Linux shell 字符串比较大小

## 字符串$1 小于 字符串$2vlt(){        if [ $# -lt 2  ] ;then                echo "参数错误"                return 1        fi        [ $1 = $2 ] && return 1        litter=$(echo -e "$1\n$2" | sort | head -n1)        if [ $litter = $1 ] ;then                return 0        else                return 1        fi}