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You can use the following:

grep /etc/group -e "docker"
grep /etc/group -e "sudo"

    
    
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            answered Oct 7, 2016 at 15:27
        
        
    
    
        
    
    
        Farhad FarahiFarhad Farahi38.5k7 gold badges78 silver badges74 bronze badges
        
    

        
    





            
    


                                    

        
        
        
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Docker creates the docker group, but also any sudoers can use Docker, so you need to check two group memberships:

getent group sudo
getent group docker

    
    
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            answered Oct 7, 2016 at 15:13
        
        
    
    
        
    
    
        Elton StonemanElton Stoneman19k5 gold badges49 silver badges45 bronze badges