how can u read a file line by line in shell script ?

hello ,
plz help for below script req:-

how can we read a file line by line in shell script ?

 
while read l
do
 . . . $l . . . .
done < file

I wonder if the request was not for something more "interactive" like :
Press enter for next line...

Like less/pg/more but one line at a time?

hehehe

pg -1 infile