How to use the read command in Bash?

Question

When I try to use the read command in Bash like this:

echo hello | read str
echo $str

Nothing echoed, while I think str<

Answer 1

Typical usage might look like:

i=0
echo -e "hello1\nhello2\nhello3" | while read str ; do
    echo "$((++i)): $str"
done

and output

1: hello1
2: hello2
3: hello3