Write bash script that reads from pipe

Question

I'd like to do something like that:

cat file.txt | ./myscript.sh

file.txt

http://google.com
http://amazon.com
...

How can I read data in myscript.sh?

Answer 1

You can do this with a while loop (process line by line), this is the usual way for this kind of things :

#!/bin/bash

while read a; do
    # something with "$a"
done

For further informations, see http://mywiki.wooledge.org/BashFAQ/001

---

If instead you'd like to slurp a whole file in a variable, try doing this :

#!/bin/bash

var="$(cat)"
echo "$var"

or

#!/bin/bash

var="$(</dev/stdin)"
echo "$var"