Create a ksh function that unsets itself

Question

In ksh93 this barfs:

source foo.ksh
foo die

when foo.ksh contains just:

foo() {
  echo Foo!
  if [[ "$1" = "die" ]]; then
    unset -f foo
  fi
}

in bash, it works. How can a function unset itself in ksh?

Answer 1

The same works in ksh too. Consider foo.ksh is :

foo()
{
    echo "Bar"
    if [ "$1" = "die" ]
    then
    unset -f foo
    fi
}

Consider main.ksh is :

source foo.ksh
foo die
foo # you haven't checked if the function is unset or not

Gives you :

bar --> first call
main.ksh[10]: foo: not found [No such file or directory]  --> second call

Check it [ here ].