🚀 go-pugleaf

	% /tmp/test.sh /etc/passwd
	Great.  can open /etc/passwd
	% /tmp/test.sh /dev/null
	Hmmmmm. can't open /dev/null

This is apparently correct behavior for sysV, and the code somehow crept
over the wall and infected the bsd4.2 '[' (which is builtin to /bin/sh;
a vestigial remnant of less prosperous days).

The (non-builtin) 'test' command seems to work correctly.  Maybe the
easiest fix is to have 'install' use 'test' instead of '['.  In fact,
this even works, provided you have a /bin/[ (linked to 'test'):

	#!/bin/sh
	if /bin/[ '!' -f $1 ]
	then	echo "Hmmmmm. can't open $1"
	else
		echo "Great.  can open $1"
	fi
	exit 0

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