[tex-live] More on multiple minuses

[Philip TAYLOR]

The TeX Live Guide (hereinafter TLG) says

	For full documentation:
	> tlmgr -help

but being a distrustful soul, I tried


	> tlmgr    help
	> tlmgr   -help
	> tlmgr  --help
	> tlmgr ---help

the first three of which appeared to generate
the same output, and the fourth of which
diagnosed an error.  Is there any difference
between the three forms that work, because if
TLM accepts some of these in only some contexts,
it will lead to confusion ...

** Phil.