shell脚本内调用另外一个shell脚本的几种方法讲解

#! /bin/bash
# 参数的使用
# 我们可以在执行Shell脚本时,向脚本传递参数,脚本内获取参数的格式为:$n. n代表一个数字,1为执行脚本的第一个参数，2为执行脚本的第二个参数，以此类推
if [ $# != 3 ]; then
    echo "usage: $0 param1 param2 param3"
    echo "e.g: $0 1 2 3"
    exit 1
fi
echo "执行文件名： $0"
echo "param1: $1"; echo "param2: $2"; echo "param3: $3"
parameters=$*
# 特殊字符用来处理参数
# $#: 传递到脚本的参数个数
echo "参数个数为： $#"
# $*: 以一个单字符串显示所有向脚本传递的参数
echo "传递的参数作为一个字符串显示: $*"
# $@: 与$*相同，但是使用时加引号，并在引号中返回每个参数
echo "传递的参数作为字符串显示: $@"
for i in "$*"; do # 循环一次
    echo "loop"; echo $i
done
echo ""
for i in "$@"; do # 循环三次
    echo "loop"; echo $i
done
get_csdn_addr()
{
    echo "csdn addr: https://blog.csdn.net/fengbingchun/"
}

#! /bin/bash
params=(source /bin/bash sh .)
usage()
{
	echo "Error: $0 needs to have an input parameter"
	echo "supported input parameters:"
	for param in ${params[@]}; do
		echo "  $0 ${param}"
	done
	exit -1
}
if [ $# != 1 ]; then
	usage
fi
flag=0
for param in ${params[@]}; do
	if [ $1 == ${param} ]; then
		flag=1
		break
	fi
done
if [ ${flag} == 0 ]; then
	echo "Error: parameter \"$1\" is not supported"
	usage
	exit -1
fi
echo "==== test $1 ===="
$1 parameter_usage.sh 1 2 3
echo "parameters: ${parameters}"
get_csdn_addr
$1 parameter_usage 123
#ret=$?
#if [[ ${ret} != 0 ]]; then
#	echo "##### Error: some of the above commands have gone wrong, please check: ${ret}"
#	exit ${ret}
#fi
if [ $? -ne 0 ]; then
    echo "##### Error: some of the above commands have gone wrong, please check"
	exit -1
fi
echo "test finish"