[gm3dmo]

The dozens of different versions of UNIX did not help either. A bug in their sed grep awk toolchain meant that you had to write workarounds for things like "Sequioa Unix" to support is single customer. as long as the UNIX flavor had a PERL port all of that could go away.

PERL being open source meant you were a "make" away from having the same environment on all those unixes.

even today when the dozens of UNIX distributions have collapsed into a couple of Lunux flavours, getting a shell based script to work reliably between say macOS and redhat can take some effort.