Want to add a user to a specific group using the command line? dseditgroup is your friend! Add users, or groups, to a group you create or system groups which control access to services.
Make sure to insert your local admin's short name (localadmin) and the user (username) or group (groupname) you're trying to add.
Remote Login (SSH)
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user com.apple.access_ssh
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group com.apple.access_ssh
Screen Sharing
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user com.apple.access_screensharing
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group com.apple.access_screensharing
Print Administrators
User: dseditgroup -o edit -n /Local/Default -u localadmin -p -a username -t user _lpadmin
Group: dseditgroup -o edit -n /Local/Default -u localadmin -p -a groupname -t group _lpadmin
Explanation:
-o specifies the operation (edit in this case)
-n specifies the domain (another example is /LDAPv3/127.0.0.1 on an ODM)
-u is the admin user to authenticate with (use diradmin for network domains)
-p tells it to prompt for a password
-a tells it to add a user or group
-t specifies the type, user or group
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