What is the difference between calling “id -G” and “id -G -r”?

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I know the -r flag should print the real group the user is in. But since -G already prints all his groups, does this make a difference?



What does id -gr xxxsome_user really print out? How can a user have a real group? I thought only process could have effective and real groups.






shell coreutils






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    up vote
    0
    down vote

    favorite












    I know the -r flag should print the real group the user is in. But since -G already prints all his groups, does this make a difference?



    What does id -gr xxxsome_user really print out? How can a user have a real group? I thought only process could have effective and real groups.






    shell coreutils






    share























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I know the -r flag should print the real group the user is in. But since -G already prints all his groups, does this make a difference?



      What does id -gr xxxsome_user really print out? How can a user have a real group? I thought only process could have effective and real groups.






      shell coreutils






      share













      I know the -r flag should print the real group the user is in. But since -G already prints all his groups, does this make a difference?



      What does id -gr xxxsome_user really print out? How can a user have a real group? I thought only process could have effective and real groups.






      shell coreutils




      shell coreutils





      share












      share










      share



      share










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      SlowerPhoton

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