shell读取文件每一行的方式

#使用read命令读取一行数据
while read myline
do
 echo "LINE:"$myline
done < datafile.txt


#使用read命令读取一行数据
cat datafile.txt | while read myline
do 
 echo "LINE:"$myline
done


#读取一行数据
cat datafile.txt | while myline=$(line)
do 
 echo "LINE:"$myline
done


#读取一行数据
while myline=$(line)
do 
 echo "LINE:"$myline
done < datafile.txt


#使用read命令读取变量数据
cat datafile.txt | while read paraa parab parac
do
 echo "PARAA:"$paraa
 echo "PARAB:"$parab
 echo "PARAC:"$parac

done

#或者使用for循环

for line in `cat filename(待读取的文件)`
do
    echo $line
done

#使用read命令读取变量数据
while read paraa parab parac
do
 echo "PARAA:"$paraa
 echo "PARAB:"$parab
 echo "PARAC:"$parac

done < datafile.txt

#说明：
#for逐行读和while逐行读是有区别的,如:
$ cat file
1111
2222
3333 4444 555
 
$ cat file | while read line; do echo $line; done
1111
2222
3333 4444 555
 
$ for line in $(<file); do echo $line; done
1111
2222
3333
4444
555