Sed predates Linux (by a very long time). There is an opengroup standard for sed: http://pubs.opengroup.org/onlinepubs/7908799/xcu/sed.html http://pubs.opengrou

Sed predates Linux (by a very long time). There is an opengroup standard for sed: http://pubs.opengroup.org/onlinepubs/7908799/xcu/sed.html http://pubs.opengroup.org/onlinepubs/7908799/xcu/sed.html As long as the OSX version of sed conforms to the standard there is no problem if it is incompatible in some areas with the GNU version used on Linux.