Within a shell, what is the difference between [ -n undefinedString ] and [
-n "$undefinedString" ] ?
With bash I get:
$ unset undefinedString
$ [ -n undefinedString ] && printf "$undefinedString" | od -c
0000000
$ [ -n "$undefinedString" ] && printf "$undefinedString" | od -c
$ [ -z "$undefinedString" ] && printf "$undefinedString" | od -c
0000000
I mean, shouldn't [ -n undefinedString ], which I guess is without shell
expansion, give an error? Clearly
it is an empty string.
I think I am confusing various terms. An explanation, perhaps by using the
concept of C like strings,
might be helpful.
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