$LINENO within functions

[Stefan Farfeleder]

Hi,

SUSv3 says the following about $LINENO:

"Set by the shell to a decimal number representing the current
sequential line number (numbered starting with 1) within a script or
function before it executes each command. If the user unsets or resets
LINENO , the variable may lose its special meaning for the life of the
shell. If the shell is not currently executing a script or function, the
value of LINENO is unspecified. This volume of IEEE Std 1003.1-2001
specifies the effects of the variable only for systems supporting the
User Portability Utilities option."

My initial interpretation of "or function" was that it means $LINENO
within a function should be relative to the function's beginning line.
Now I'm not so sure anymore.  Bash release 2.05b changed the expansion
of $LINENO within functions to absolute numbering, stating this is
required by POSIX.  But then I wonder about the meaning of "or
function".  Does it mean functions in interactive scripts?  Because for
functions in shell scripts the mentioning of both "script" and
"function" seems redundant.

Stefan