I'm still holding SCO-Unixware with Shell-scripting certificate... Was once suddenly pushed upon us... Would bring much profit, many works!
LOL
HORRIBLE system. Even ping had a bug when we started subnetting ;p But mostly I remember the performance... My Pentium DX400 with 10k RPM SCSI disk was CRUNCHING for performance... Just running the system
Well deserved it went down, never missed it. Only SUN servers (without binaries pre-compiled) was worse... I consider AS/400 as my problem, them sweet things ;-)