shell 检查脚本输入参数个数

#!/bin/bash
# $1 gpuid  $2 workdir  $3 model_path

if [ $# -ne 2 ];
then
    echo "$1 gpuid param required"
    echo "$2 change workdir required"
    exit
fi

原文：https://www.cnblogs.com/TianyuSu/p/14719508.html