I have figured out the answer for this program, however I don't really understand what does backslush means in here.

I tried to remove the backslush, then the program print all of numbers from 1 to 4321, but it did not grep how many times number 5 appear.

When I put backslush, it just show the number how many time number 5 appear.

here is my code:

```
#!/bin/bash
seq 4321 | \
while read -n1 digit; do
 echo $digit
done | grep -c 5

```