Enable Remote Access – Command Line

To enable Remote Management from the command line, enter the following into Terminal

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate -configure -users ARDADMIN -access -on -restart -agent -privs -all -allowAccessFor -specifiedUsers -computerinfo -set1 -1 "INFO1" -set2 -2 "INFO2" -set3 -3 "INFO3" -set4 -4 "INFO4"
sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart --configure -access -on -privs -all -users ARDADMIN

You will need to switch ARDADMIN for the account you wish to give ARD access to.

INFO1, INFO2, INFO3, INFO4 refer to the fields located in System Preferences, Sharing, Remote Management, Computer Settings

 

To enable SSH for one specific user, enter the following into Terminal

sudo systemsetup -setremotelogin on
sudo dseditgroup -o create -a USER -t user -u USER -q com.apple.access_ssh

You will need to change USER for the shortname of the user you wish to grant SSH access to.