Sean explained the math of my expression to Dallman, but he added,
| (it could be any variable which exists - so there's really no magic
| to the use of HOST here - that's probably what puzzled dman).
Yes, there is magic to the use of HOST. The expression must match exactly
twice. So not only will the goal be missed if the variable (a) is unset, but
it also will if the variable (b) is null, (c) begins with a newline, (d) ends
with a newline, or (e) contains only one character.
Even LOGNAME might have only one character. HOST, though, is a lock to escape
all five problems.
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