shell编程：字符串练习题string.sh

string.sh脚本

#!/bin/bash
#

string="Bigdata process framework is Hadoop,Hadoop is an open source projeck"

function print_tips

{
           echo "**************************************************************"
           echo "(1) 打印string的长度"
           echo "(2) 删除字符串中所有的Hadoop"
           echo "(3) 替换第一个Hadoop为Mapreduce"
           echo "(4) 替换全部的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 your choice (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 "Eroor,inpu only in{1|2|3|4|q|Q}"
              esac

done

编写思路：

1.先把功能函数写出来

2.跟句要求用choice+while循环实现