[OS X TeX] .pdf or .dvi?

[David Goldschmidt]

I installed GW's Tex-i package (dated 2006/10/10 21:50:35)
and I run latex from the command line.  When I do this on my
main file, which is part of a book, pdfeTeX is invoked and I get
a .pdf file.  I assumed that this is always what happens, probably
because the Mac is pdf-friendly.  But I just happened to run latex
on an old latex file, and I got .dvi output, even though pdfeTeX was
still invoked.  So how is the output type actually determined?

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