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#!/bin/bash
# $# 用于获取参数的个数
echo "$#"
# $* 用于获取所有参数
echo "$*"
# $1 $2 $3 用于获取第 1 2 3 个参数
echo "$1,$2,$3"
# $? 用于获取上一条命令的返回值，0 为正确，非 0 为错误
echo $?
rm a.txt
# $$ 用于获取当前脚本的进程号
echo $$
# $0 用于获取当前脚本的名称
echo $0
# 测试使用 ./d11.sh 1 2 3