cp $LFS/usr/bin/gunzip $LFS/usr/bin/gzip $LFS/bin && rm $LFS/usr/bin/gunzip $LFS/usr/bin/gzip: The reason we don't simply use mv to move the files to the new location is because gunzip is a hardlink to gzip. On older distributions you can't move a hardlink to another partition (and it's very possible that $LFS and $LFS/usr are separate partitions). With more recent distributions this isn't a problem. If you run mv to move hardlinks across partitions it'll just do a regular cp and discard the hardlink. But, we can't assume that every host distribution has a new enough kernel and fileutils that works this way.