how can I tell if a variable is defined.
Where this is tripping me up
On some of my relay boxes I set $!msg = $msg
on my central box I do a json parse and then I want to detect if there is a
$!msg variable (some things are sending me data that has always been in JSON
format, so $!msg was never set) and if there isn't a $!msg, I set $!msg = $msg
so that anything that's trying to get traditionally formatted data will get
the JSON instead of a blank line.
currently I'm testing for $!msg == '' but I do occasionally have some stuff that
does output log messages with a blank body (for example, I do iostat 60 |logger
-t iostat), so sometimes $!msg is defined, but is blank.
how do I tell the difference between these two conditions?
David Lang
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