练习
需求描述：
变量string="Bigdata process framework is Hadoop, Hadoop is an open source project"
执行脚本后， 打印输出string 字符串变量，并给出用户以下选项：
1、打印string长度
2、删除字符串中所有的Hadoop
3、替换第一个Hadoop为Mapreduce
4、替换全部Hadoop为Mapreduce
用户输入数字1|2|3|4，可以执行对应的功能，输入q|Q则退出交互模式
变量处理语法说明
image.png
完整代码
string="Bigdata process framework is Hadoop, Hadoop is an open source project"
function print_tips
{
echo "**********************"
echo "1、打印string长度"
echo "2、删除字符串中所有的Hadoop"
echo "3、替换第一个Hadoop为Mapreduce"
echo "4、替换全部Hadoop为Mapreduce"
echo "**********************"
}
function len_of_string
{
echo ${#string}
}
function del_hadoop
{
echo ${string//Hadoop/}
}
function rep_hadoop_mapreduce_first
{
echo ${string/Hadoop/Mapreduce}
}
function rep_hadoop_mapreduce_all
{
echo ${string//Hadoop/Mapreduce}
}
while true
do
echo "【 string=$string 】"
echo
print_tips
read -p "Please input 1|2|3|4|q|Q: " choice
case $choice in
1)
len_of_string;;
2)
del_hadoop;;
3)
rep_hadoop_mapreduce_first;;
4)
rep_hadoop_mapreduce_all;;
q|Q)
exit;;
*)
echo "Error, input only in {1|2|3|4|q|Q}";;
esac
done
运行效果
image.png
