ksh doesn't allow one to define a type more than once.
If you type "typeset -T xx=()" twice the second time you'll see the message:
ksh: xx: type cannot be redefined
How can one see the defined types? Other languages have a defined
function which allows one to test if a symbol has been defined.
For things other than types, one can do something like:
function _defined {
(set | grep "^$1=")2>&1 >/dev/null
}
But this doesn't work for types. Also note that:
typeset +p notthere # same for -p
gives a zero return code whether or not "notthere" is defined or not.
And once a type has been defined, can it be undefined or redefined? If
so, how?
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