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I can add a message to the macos system log via the command line on Sierra or later as follows:

logger -t "TestTag" "testing 1 2 3"

How do I find all messages that have been tagged with TestTag?

I can use log stream but I can't find how to filter for that tag. Any other command line solution would be fine too.

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  • What MacOS version?
    – Prado
    Aug 9, 2019 at 17:24
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    I tried it on MacOS Catalina, 'Tags' does not shows on log stream, just the message. Also not showing on graphical Console.app. But the message shows on both, and I know how to filter it using 'log stream' but this would not be the correct answer since you asked for the 'tag' filter. That is why I asked for your MacOS version, because 'tag' is invisible anywhere on my system version
    – Prado
    Aug 9, 2019 at 18:23
  • @Prado I'm looking for >= Sierra
    – Les Hazlewood
    Aug 9, 2019 at 18:59
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    I think the closer it can get is filtering for 'logger' process: log stream --info --predicate 'process == "logger"', it looks like 'tag' is being completely ignored by the Unified Log system. But if you try logger -is -t "TestTag" "testing 1 2 3" (using -is parameter) the tag is shown on terminal, but still not logged to database. Log database always logs it as [logger] message
    – Prado
    Aug 9, 2019 at 20:10
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    @Prado that's a shame - that means that tagging is effectively broken and useless. I wonder why it exists?
    – Les Hazlewood
    Aug 12, 2019 at 22:03

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