특정 그룹의 멤버 확인 dscl . -read /Groups/ GroupMembership 그룹에 멤버 포함 sudo dscl . append /Groups/<그룹> GroupMembership <유저> ~~(관련 내용)~~ For those who are looking for the same answer to newer versions of Mac OS, I've found this: To add a user to a group, you need this command ($USER is the current logged-in user) : $ sudo dscl . append /Groups/wheel GroupMembership $USER I was trying to add my user to the wheel group, to be able to manipulate the /Library/WebServer/Documents folder. Besides that, I had to change the permissions to that folder, as by default it is 755. I've changed it to 775 with: $ sudo chmod -R 775 /Library/WebServer/Documents ~~~~~~~~~~~~ sudo dscl . append /Groups/staff GroupMembership wheel