Terminal Command to Start ScreenSaver (or Lock Screen)

Is there any way to start the ScreenSaver with a Terminal command?
The curtain mode is great, but if one connects to a computer with locked screensaver, I cannot figure how to reset the screensaver (or screen locking) before closing the connection. Otherwise the computer is locally accessible until the autostart of the screensaver...

open '/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.a pp'
defaults -currentHost write com.apple.screensaver idleTime 180
will set the screensaver startup idletime to 3 minutes
you can read the current settings by issuing
defaults -currentHost read com.apple.screensaver
defaults -currentHost write com.apple.screensaver idleTime 0
is for never activate.
i've tried using 1 and it doesn't come on right away. the fastest i can get it to start is with 60 (60 secs)

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your command line
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In terminal type,
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If you decide to use applescript (do shell script descibed earlier) then you could just use the full pathname to whereever you saved the script and save that as a applescript application. Again test it and then add to your login items. I would bother adding an alias to .bash_profile. That just adds to the complextity.
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Why does siri starts in the locked screen even if i don't allow it in the restrictions??

Why does siri starts in the locked screen even if i don't allow it in the restrictions? if a thief got my phone he can hold 3 sec the home button and with siri he can call and do what every he wants..

Thanks, you're my hero! :-)
The problem wasn't about the Restricitions because they are really irrelevant. The Problem was that i didn't had this Option to turn Siri off in the Touch ID & Passcode-Menu because i had to activate Siri first.
Here ist the way to deactivate Siri in the locked Screen:
[1] Settings > General > Siri > turn Siri on
[2] Settings > Touch ID & Passcode > ALLOW ACCESS WHEN LOCKED > turn Siri off

(SOLVED) Lock screen suddenly doesn't work as expected

It doesn't matter which lock screen (PIN, swipe, etc.) I choose, after the first unlock (after a reboot or change of lock screen), the phone no longer locks. Using the power button to lock doesn't work and I have the phone set to lock right away on sleep. It was working fine a few hours ago and there wasn't anything new I did to the phone.
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Go to Solution.

Hello, I feel pretty dumb. I must've hit the "Disable lock screen" option in the BatteryBot Pro app by accident...I forgot it even had that option.
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Thank you for providing the above information.
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From which location have you deleted the picture?
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Welcome to Apple Support Communities
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Doug Lerner2 wrote:
I think the more "assistive" features are turned on the harder it is for both my sighted and blind friend to use.
Yes, that can sometimes be true.
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Hello,
I managed to add a Keychain Access icon to my bar, to make it easier to Lock Screen, but i want to start the screensaver when i lock the screen, how is that possible?

Update: you can do this with Automator.
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Terminal command to lock and unlock the dock?

Hello,
I manage hundreds of iMacs running Yosemite at a school site. I use parental controls with the lock dock feature turned on. I would like to periodically unlock the dock to customize it with new icons, but have not found a terminal command that works, or a streamlined process that is time efficient.
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defaults write com.apple.dock contents-immutable -bool true
Then use your preferred method to Log-Out [e.g. Key Combo ⇧⌘Q or  [Top Left Menu] then select Log Out “name”]
and then Log-In again.
2. Use Terminal to UNLOCK the Dock by C&P or typing in:
defaults write com.apple.dock contents-immutable -bool false
Then use your preferred method to Log-Out [e.g. Key Combo ⇧⌘Q or  [Top Left Menu] then select Log Out “name”]
and then Log-In again.
NB. You will be solely responsible for your actions making changes to the Operating System.

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I'm a new owner of Xperia Z3 Compact and I have noticed a problem when launching camera. The app itself works perfectly well but when trying to launch camera from locked phone (screen locked with symbol) it shows only black screen with error message that camera app it unaccessible. After removing lock screen protection both camera symbol on lock screen and dedicated camera button works as intended. Is it supposed to be that way? On my previous phone I could launch camera app without unlocking screen but couldn't access any other parts of the phone. I'd love to have it working the same way here especially with the dedicated camera button.
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Terminal Command to Start ScreenSaver (or Lock Screen)

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