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Hello Lua gurus :-)

I would like to know if it is possible to replace
standard output and error streams in Lua, in
order to redirect output from Lua internals and
from Lua scripts.

Ideally I would like to provide my own functions
for displaying results from Lua calls.

Does someone know how to achieve this ?
Is it possible to keep Lua core librairies "as is", or
do I have to change the implementation (e.g replacing
"fprintf" etc. by my own functions ?)

In Python it is sufficient to reassign to sys.stdout or
stderr a file-like object ; is it the same in Lua with
io.stdout ? Does it work in all cases ?

Thanks in advance for your help,