There's no need to filter hostnamectl's output with awk because its man
page says:

    hostnamectl [OPTIONS...] {COMMAND}

       --static, --transient, --pretty
	   If status is used (or no explicit command is given) and one
	   of those fields is given, hostnamectl will print out just
           this selected hostname.

E.g. hostnamectl --static status => ansible.example.org

hostname module was lacking support for Scientific Linux, this commit adds it.

Tested under Fedora 19 and OpenSUSE 12.3. Not tested on ArchLinux.