How the shell reads each line of the file

1. Read a row of data using the Read command

While read Mylinedo echo "line:" $mylinedone < Datafile.txt

2. Read a row of data using the Read command

Cat Datafile.txt | While read Mylinedo  echo "line:" $mylinedone

3. #读取一行数据

Cat Datafile.txt | While myline=$ (line) does  echo "line:" $mylinedone

4. #读取一行数据

While myline=$ (line) does  echo "line:" $mylinedone < Datafile.txt

5. #使用read命令读取变量数据

Cat Datafile.txt | While read Paraa Parab paracdo echo "Paraa:" $paraa echo "Parab:" $parab echo "Parac:" $paracdone

6. #使用read命令读取变量数据

While read Paraa Parab paracdo echo "Paraa:" $paraa echo "Parab:" $parab echo "Parac:" $paracdone < Datafile.txt

How the shell reads each line of the file