To save the grep, you can do:

    sed -Ene 's/^location: (.*)?utm.*$/\1/p'

If you've got a newer `curl`, you can just print the header:

    curl -I -s -o /dev/null -w '%header{location}' <url>

But you'll obviously still need the sed if you want to trim off the UTM cruft. Unless you want to go the route of `bash` substitutions.

    l="$(curl -I -s -o /dev/null -w '%header{location}' <url>)"
    echo "${l%%?utm*}"