mwoehlke <[EMAIL PROTECTED]> wrote:
> Poor Yorick wrote:
>> The following line does not perform the "echo" command.
>> : ${FAKEVAR?} || echo hello
>
> What you probably want is:
> [ "$FAKEVAR" ] || echo hello
That doesn't distinguish between an unset variable and a variable set
to an empty value. If that distinction is important, you can use:
test "${FAKEVAR+set}" = set
You can also wrap it up in a function for convenience:
is_set() {
eval "test \"\${${1?}+set}\" = set"
}
paul
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