The GNU coreutils are a reimplementation of the Unix utilities. With some caveats, the same tools are available on BSD and Solaris derivatives which are both Un

The GNU coreutils are a reimplementation of the Unix utilities. With some caveats, the same tools are available on BSD and Solaris derivatives which are both Unix. So while GNU is obviously an important project, it would not be correct to say "xargs" is not a Unix tool.