Question

I’m a total Linux noob. I just want to append a field in the first column
Ex. 192.168.0.254 mwd.com

wget -O - "http://mirror1.malwaredomains.com/files/justdomains" | ??? > /var/hosts.md

I was thinking to use sed but there’s no data to substitute.

Answer 1

You can substitute with a beginning-of-line or end-of-line marker:

> echo line | sed -e 's/$/ foobar/'
line foobar
> echo line | sed -e 's/^/foobar /'
foobar line