I need to relearn UNIX because of changes at work, and it sure looks like DOS is just a dumbed down version of UNIX with the slashes (/) reversed.
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There's much truth to this, in a general sense; that is, the true pedigree of MS DOS is an OS named CP/M (Control Program for Microcomputers)
<http://en.wikipedia.org/wiki/CP/M>
and CP/M's command interface design concepts were drawn from the common stream of ideas that fed into the creation and continued modification of UNIX.
But that's a topic for another day.
As to UNIX quick guides, I suggest these:
Learn UNIX in 10 minutes. Version 1.2
<http://freeengineer.org/learnUNIXin10minutes.html>
Wikibooks UNIX Guide
<http://en.wikibooks.org/wiki/Guide_to_UNIX_commands>
And if you're really interested in the MS DOS story, check this out:
History of MS DOS
<http://en.wikipedia.org/wiki/MS-DOS>
Of course, because of your environment, you'll no doubt be using SOLARIS and there are some command line differences so you may want to try this:
<http://www.hta-bi.bfh.ch/Resources/Computing/SunGroup/Info/QuickRef/>
or, my personal favorite the Universal Command Guide:
which includes SOLARIS info.
.d.