[gnutls-devel] GnuTLS | gnutls-cli writes to stdout and lacks a quiet mode (#845)

[Development of GNU's TLS library]

Björn Jacke created an issue: https://gitlab.com/gnutls/gnutls/issues/845



it would be nice if gnutls-cli could be used as a tls client, that does not spit in extra informationon stdout. The stdout information maked it unusable for connect commands of other applications. For example it could be used by the "plugin" parameter of fetchmail or by the -e option of rsync if stdin/stdout would be clean of extra info output.
openssl allows to be very quite if it's called like "openssl s_client -quiet -verify_quiet". It would be great if gnutls-cli can also get a quiet mode for this purpose.

In addition to that: the tls connection information that is currently outputted when a TLS connection is being made goes to stdout. It might generally make more sense to move that information to stderr, so that gnutls-cli can be used as a connect client as written above and still output helpful information without poisoning the std output channel.

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