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