Linux 检测文件是否有更新——改进

#!/bin/bash
cd //home/linhaot/sharing/RK/project
a=0
find . -type f -name "Makefile"|while read LINE
do
	cd //home/linhaot/sharing/RK/project
	cd ${LINE%%Makefile*}	
	echo ${LINE%%Makefile*}
	if [ "$(ls|grep "change")" = "change_time.txt" ]
	then
		old_time=$(cat change_time.txt)
		echo "oldtime=$old_time"
		new_time=$(stat -c "%y" Makefile)
		echo "newtime=$new_timen"
		if [ "echo $old_time" != "echo $new_time" ]
		then
        		cd //home/linhaot/sharing/RK/project
        		./build.sh | tee /home/linhaot/sharing/rk_test.txt
			cd ${LINE%%Makefile*}
			stat -c "%y" Makefile > change_time.txt
		fi
	else
		cd ${LINE%%Makefile*}
		touch change_time.txt
		stat -c "%y" Makefile > change_time.txt
	fi
done


cd //home/linhaot/sharing
grep -n "(RK_APP_TYPE)=" rk_test.txt
grep -n "app_src" rk_test.txt

现在是要改不同路径下的其他makefile，之前写的程序只针对特定makefile，所以为了简化过程，我对之前的代码进行一个改进。

linux，检测文件是否有更新_如来fo的博客-CSDN博客

find . -type f -name "Makefile"

${LINE%%Makefile*}

 linux中字符串截取的八种方法_涤生大数据的博客-CSDN博客_linux截取字符串中的一部分

这里将find读出的内容用 “|”输出到while然后对一个个路径进行操作。

find . -type f -name "Makefile"|while read LINE
do

done

 要记得什么是整数操作的，什么是字符串操作的

touch change_time.txt

若是用vim会报错