linux shell 按行循环读入文件方法

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

前二种方法可以分别简化成一行简短的代码

cat one.log|while read line;do echo $line;done     while read line; do echo $line; done<one.log