Get function name in KornShell script

Question

I'd like to get the function name from within the function, for logging purposes.

KornShell (ksh) function:

foo ()
{
    echo "get_function_name some useful output"
}

Is there anything similar to $0, which returns the script name within scripts, but which instead provides a function's name?

Answer 1

If you define the function with the function keyword, then $0 is the function name:

$ function foo {
>     echo "$0"
> }
$ foo
foo

(Tested in pdksh.)

Answer 2

[...] what are the main pros/cons of using keyword function?

Main pro is that "typeset myvar=abc" inside the function is now a local variable, with no possible side effects outside the function. This makes KSH noticeably safer for large shell scripts. Main con is, perhaps, the non-POSIX syntax.