as is the GNU Assembler, AS - the portable GNU assembler. It's found in binutils
but if you do:
sudo dnf install binutils
Entering as --version
from a terminal window will let you know:
GNU assembler version 2.25-17.fc23
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-redhat-linux'.
man as
Regards.,