Creating a file from input stream

Shell Programming and Scripting
1

Hi,

Need some help with creating a file from input steam. Meaning from following command myfunc should be able to store the input stream to a file.

echo a b c | myfunc

The file thus created should have -

a
b
c

Here's what I've tried in myfunc() but didn't help -

myfunc() { cat &0 > /tmp/1 }
2

Probably because that's not valid syntax for a function, or redirection.

myfunc() {
        cat > /tmp/$$
}
3

Try:

myfunc()
{
  tr " " "\n" > /tmp/1
}
4

Great, thanks guys.
Also I was wondering if there's a way to check if the stream is empty or not?
Currently what I do it check the size of /tmp/$$ after I created it from the steam. Is there a better way of doing it?