evaluating lines from stdout

Question

I have a bash script that is executing a program in a loop. I want to evaluate each line from the stdout and do something if it matches my condition.

I still want to be able to see stdout on the screen. Is there a simple way to accomplish this? Thanks!

Answer 1

There are several variants of looping over input, but one possibility is thus:

my_cmd | while read line; do
    echo "$line"
    my_process "$line"
done