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If your Mac is running with OS X El Capitan, macOS Sierra, High Sierra, or Mojave, you won’t see the two buttons, instead, just click First Aid and it will tell you whether disk repair is needed or not. (Once you see that screen, you can release the keys you were holding down.) Click on Disk Utility. Then, click on your Mac’s built-in hard drive in the left column of Disk Utility.

Interfaces with launchd to load, unload daemons/agents and generally control launchd. launchctl supports taking subcommands on the command line, interactively or even redirected from standard input.

Files

~/Library/LaunchAgents Per-user agents provided by the user.
/Library/LaunchAgents Per-user agents provided by the administrator.
/Library/LaunchDaemons System wide daemons provided by the administrator.
/System/Library/LaunchAgents macOS Per-user agents.
/System/Library/LaunchDaemons macOS System wide daemons.

launchd no longer loads configuration files from the network

Exit Codes

launchctl will exit with status 0 if the subcommand succeeded.
Otherwise, it will exit with an error code that can be given to the error subcommand to be decoded into human-readable form.

The syntax for launchctl changed in macOS 10.10 (Yosemite) the examples below show both the old and new syntax for starting and stopping launch scripts (services). The new syntax generally does not require sudo.

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Examples

Display the launch scripts for all users that are currently loaded/running (legacy syntax):
$ sudo launchctl list
Display the launch scripts that are currently loaded for user ID 504 (new syntax):
$ launchctl print gui/504

Display the launch scripts that are currently loaded/running for root:
$ launchctl print system

Unload the Amazon Music App daemon:
$ launchctl unload ~/Library/LaunchAgents/com.amazon.music.plist
To make this permanent edit that .plist file and change KEEP ALIVE and LAUNCH AT LOAD to FALSE. Then lock the file. This will prevent the Amazon app from running at all.

Enable remote SSH login (legacy syntax):
$ sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist

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Enable remote SSH login for login 504 (new syntax):
$ launchctl bootstrap gui/504 /System/Library/LaunchDaemons/ssh.plist

Disable remote SSH login (legacy syntax):
$ sudo launchctl unload -w /System/Library/LaunchDaemons/ssh.plist

Disable remote SSH login for login 504 (new syntax):
$ launchctl bootout gui/504 /System/Library/LaunchDaemons/ssh.plist

Disable the macOS Notification Centre (legacy syntax):
$ launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
$ killall NotificationCenter

Disable the macOS Notification Centre for login 504 (new syntax):
$ launchctl bootout gui/504 /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
$ killall NotificationCenter
An alternative is to turn on the Notification “Do Not Disturb” from the Menu Bar of macOS which lasts for 1 day.

Re-enable the macOS Notification Centre (legacy syntax):
$ launchctl load -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
Then double-click '/System/Library/CoreServices/Notification Center” to launch it again.

Re-enable the macOS Notification Centre for login 504 (new syntax):
$ launchctl bootstrap gui/504 /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
Then double-click '/System/Library/CoreServices/Notification Center” to launch it again.

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“A good rule for rocket experimenters to follow is this: always assume that it will explode” ~ 'Astronautics,' issue 38, October 1937

Related macOS commands:

The macOS equivalent of Windows services is Launchd.
The macOS equivalent of services.msc on Windows is launchctl.
Launchd.info - Description of launchd, agents and daemons.
The daemons managed by launchd can be on demand or can be triggered periodically (this is configurable in launchd.plist).
launchd.plist(5), launchd.conf(5), launchd(8).

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