Inconsistencies in results of 'groups ' and 'getent group '!

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The observation which prompted me to ask this question is: doing groups <username> prints something like <username>: <groupname>, but doing getent group <groupname> | grep <username> doesn't print anything.



What I know is:



  • Command (1) groups <username> lists all the groups (local, ldap?) that user <username> belongs to &

  • Command (2) getent group <groupname> lists all the users (local, ldap?) that belong to group <groupname>.

Command (1) suggests that <username> is a member of group <groupname> whereas command (2) suggests otherwise as it doesn't list <username> in its result.



Anybody willing to answer, please provide brief description of how do the commands work internally i.e. where do they query groups and users related information.



(Note: I cannot share the exact outputs because of company policy and there are no syntax errors etc.)







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    up vote
    0
    down vote

    favorite












    The observation which prompted me to ask this question is: doing groups <username> prints something like <username>: <groupname>, but doing getent group <groupname> | grep <username> doesn't print anything.



    What I know is:



    • Command (1) groups <username> lists all the groups (local, ldap?) that user <username> belongs to &

    • Command (2) getent group <groupname> lists all the users (local, ldap?) that belong to group <groupname>.

    Command (1) suggests that <username> is a member of group <groupname> whereas command (2) suggests otherwise as it doesn't list <username> in its result.



    Anybody willing to answer, please provide brief description of how do the commands work internally i.e. where do they query groups and users related information.



    (Note: I cannot share the exact outputs because of company policy and there are no syntax errors etc.)







    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      The observation which prompted me to ask this question is: doing groups <username> prints something like <username>: <groupname>, but doing getent group <groupname> | grep <username> doesn't print anything.



      What I know is:



      • Command (1) groups <username> lists all the groups (local, ldap?) that user <username> belongs to &

      • Command (2) getent group <groupname> lists all the users (local, ldap?) that belong to group <groupname>.

      Command (1) suggests that <username> is a member of group <groupname> whereas command (2) suggests otherwise as it doesn't list <username> in its result.



      Anybody willing to answer, please provide brief description of how do the commands work internally i.e. where do they query groups and users related information.



      (Note: I cannot share the exact outputs because of company policy and there are no syntax errors etc.)







      share|improve this question












      The observation which prompted me to ask this question is: doing groups <username> prints something like <username>: <groupname>, but doing getent group <groupname> | grep <username> doesn't print anything.



      What I know is:



      • Command (1) groups <username> lists all the groups (local, ldap?) that user <username> belongs to &

      • Command (2) getent group <groupname> lists all the users (local, ldap?) that belong to group <groupname>.

      Command (1) suggests that <username> is a member of group <groupname> whereas command (2) suggests otherwise as it doesn't list <username> in its result.



      Anybody willing to answer, please provide brief description of how do the commands work internally i.e. where do they query groups and users related information.



      (Note: I cannot share the exact outputs because of company policy and there are no syntax errors etc.)









      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 7 '17 at 7:08









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