shell 按行循环读入文件方法

linux shell 按行循环读入文件常用代码如下：

#/bin/bash printf "*************************************\n" echo " cat file whiel read line" cat test.txt |while read line do echo $line; done printf "*************************************\n" echo "while read line <file" while read line do echo $line; done <test.txt printf "*************************************\n" echo "for line in cat test.txt" SAVEIFS=$IFS IFS=$(echo -en "\n") for line in $(cat test.txt) do echo $line; done IFS=$SAVEIFS 

注意：for line in $(cat test.txt) 当文件中有空格或者tab 时，一定要设置一下IFS变量。