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My normal usage of --debug is to run it in a terminal, where it starts by printing its SSH_AUTH_SOCK setting for me to paste into another terminal to run test commands, and then follows that with diagnostic logging of the requests it's receiving. But if you'd rather get that diagnostic information in some location other than a terminal – say, sent to a file which you're viewing in 'less' so that you can search back and forth in it, or piped to another machine because your test requests are going to come from somewhere out of sight of your monitor – then you might run 'pageant --debug' with its stdout being a pipe or a file rather than a terminal, in which case the standard stdio policy will make it unbuffered, and the diagnostics won't show up in a timely manner. The one-line code change is due to Marco Ricci, who had a rather different motivation.