Unix commands comparison
By JS on Jan 13, 2009
You may find the comparison table is useful when you port applications, though some commands in the table are out of date. Anyway, it's still handy as a quick reference.
Another interesting stuff on this web site is the poll of "the best OS". To date, 13K people voted. The top three OS are: Linux(~26%), Solaris(~21%) and AIX/Tru64(~15.5%). So, vote your favorite if you like.