[LEDE-DEV] sysupgrade send messages to stdout

[Luiz Angelo Daros de Luca]

Hello,

I noticed that sysupgrade echo all user messages to stdout.
It even need to deal with output pollution when stdout is used for data
output (like in a backup), by setting verbose to 0.

Would it be any reason for not using stderr? (like "echo 'xxx' >&2")

BTW, sysupgrade filters out /etc/META_[a-zA-Z0-9]* from /etc backup.
I never saw these files. Does anyone know what they are?
Are this filter still relevant?

Regards,

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     Luiz Angelo Daros de Luca
            luizluca at gmail.com