[Xy-pic] using a tar archive

[Michael Abbott]

> If Ross insists on distributing tar archives, perhaps he could add some
> instructions on how to extract them.  I have downloaded xymods.tgz,
> gunzipped it, read the tar man carefully and run
> tar -x xymods.tar
> and the computer simply hangs until I do ctl-C.

You meant
	tar xf xymods.tar
but it is even simpler to do
	tar xzf xymods.tgz

(For tar the leading - is optional)

	x - extract
	f - specify filename (otherwise reads from stdin, hence "hang")
	z - run input through gunzip first

It's quite reasonable and standard, even, to distribute .tgz files for
Unix, but it does confuse Windows users.