Question

When I use “cat test.file”, it will show

1
 2
  3
   4

When I use the Bash file,

cat test.file |
while read data
do
    echo "$data"
done

It will show

1
2
3
4

How could I make the result just like the original test file?

Answer 1

IFS=''
cat test.file |
while read data
do
    echo "$data"
done

I realize you might have simplified the example from something that really needed a pipeline, but before someone else says it:

IFS=''
while read data; do
    echo "$data"
done < test.file