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You can examine the certificates themselves by clicking the lock icon next to a URL: These certificates are also used to encrypt your web traffic with HTTPS. When using Safari, for example, these certificates confirm that the URL you’re looking at is actually from the domain you request. So what is a certificate? It’s a digital signature that browsers user to verify website identities and protect against imposters. RELATED: What Is HTTPS, and Why Should I Care? Trustd provides services for evaluating trust in certificates for all processes on the system. To be specific, trustd manages and checks certificates. It is a daemon, which means it’s a process that runs in the background performing critical system tasks. See Technical Q&A QA1134: Programmatically causing restart, shutdown and/or logout.Īccording to man shutdown, shutdown -h now and shutdown -r now send processes a TERM signal followed by a KILL signal.Īccording to the Daemons and Services Programming Guide, when you tell loginwindow to log out, processes that support sudden termination are sent a KILL signal, and processes that don't support sudden termination are terminated in different ways: Cocoa applications receive the applicationShouldTerminate: delegate method, foreground applications receive the kAEQuitApplication Apple event, background applications receive the kAEQuitApplication Apple event followed by a KILL signal, and daemons receive a TERM signal followed by a KILL signal after a few seconds.Today’s process, trustd, is a part of macOS itself, and has been since 10.12 Sierra. loginwindow is sent the same Apple events as above when you log out, restart, shut down, or put the the Mac to sleep normally. The four letter codes for the Apple events are listed in AERegistry.h.Īll System Events commands above send Apple events to the loginwindow process. Put displays to sleep (10.9 and later): pmset displaysleepnow Go to sleep (AppleScript): osascript -e 'tell app "System Events" to sleep' Log out after showing a confirmation dialog: osascript -e 'tell app "System Events" to log out' Log out without showing a confirmation dialog: osascript -e 'tell app "System Events" to «event aevtrlgo»'
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Restart after showing a confirmation dialog: osascript -e 'tell app "loginwindow" to «event aevtrrst»' Restart without showing a confirmation dialog: osascript -e 'tell app "System Events" to restart' Shut down after showing a confirmation dialog: osascript -e 'tell app "loginwindow" to «event aevtrsdn»' Shut down without showing a confirmation dialog: osascript -e 'tell app "System Events" to shut down'
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