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Re: The builtin array variable 'FUNCNAME' is considered unset by many ex


From: Great Big Dot
Subject: Re: The builtin array variable 'FUNCNAME' is considered unset by many expansions, even when set.
Date: Thu, 8 Nov 2018 10:19:55 -0500

> Since your example doesn't show a function being defined or called, I
> would expect it to show only empty strings.

Oh yeah, right. For some reason I thought the part about "main" still
applied. But the actual expected behavior doesn't occur either;
"${FUNCNAME[0]}" and "${FUNCNAME[*]}" are both nonempty! I thought
"${FUNCNAME}" was the incorrect one since it alone was empty, but it turns
out that's the only one that's correct.

> Also, as a side note, "${x}" and "${x[0]}" are always the same.  Literally
> always.  Doesn't matter what type of variable x is (or isn't).

That's what I thought too, before finding this bug. When executing from a
file, "${FUNCNAME[0]}" exists but "${FUNCNAME}" doesn't. I incorrectly
thought the latter was wrong, but the inconsistency is still there!



On Thu, Nov 8, 2018 at 8:28 AM Greg Wooledge <address@hidden> wrote:

> On Thu, Nov 08, 2018 at 01:15:56AM -0500, Great Big Dot wrote:
> > Description:
> > The builtin array variable FUNCNAME (which provides a way to trace the
> > stack of functions called so far) appears to be unset according to
> certain
> > bash expansions, even when it isn't. If the following code is saved to a
> > file and executed (this doesn't work at the command line), the problems
> > begin to appear:
> >
> >     printf -- '%q\n' "${FUNCNAME}"
> >     printf -- '%q\n' "${FUNCNAME[0]}"
> >     printf -- '%q\n' "${FUNCNAME[*]}"
>
> I don't see any functions there.  From the manual:
>
>        FUNCNAME
>               [...]
>               This  variable  exists  only when a shell function is
> executing.
>               Assignments to FUNCNAME have no effect.  If FUNCNAME  is
> unset,
>               it  loses  its  special  properties,  even if it is
> subsequently
>               reset.
>
> Since your example doesn't show a function being defined or called, I
> would expect it to show only empty strings.
>
> Also, as a side note, "${x}" and "${x[0]}" are always the same.  Literally
> always.  Doesn't matter what type of variable x is (or isn't).
>
>


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