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                       ILLUSTRATION                     

GO

 Each entry in the /etc/group file

 is composed of four fields:

     1.  The group name field

     2.  The group password field

     3.  The numerical group id

     4.  A comma-separated list of login names

         for valid group members!

 Let us take a closer look 

 at a typical /etc/group file ...

   root:X:0:root,admin,oper

   other:X:1:

   cron:X:2:cron

   bin:X:3:bin,who,michael,dxu,dxu2

   uucp::4:uucp

   user:X:100:yori,michael,jean,anna

   demo::200:guest,vdemo,cdemo

  The first field is the name of the group:

   root:root:0:root,admin,oper

   other:X:1:

   cron:X:2:cron

   bin:X:3:bin,who,michael,dxu,dxu2

   uucp::4:uucp

   user:X:100:yori,michael,jean,anna

   demo::200:guest,vdemo,cdemo

  The second field holds the group password:

   root:root:0:root,admin,oper

   other:X:1:

   cron:X:2:cron

   bin:X:3:bin,who,michael,dxu,dxu2

   uucp::4:uucp

   user:X:100:yori,michael,jean,anna

   demo::200:guest,vdemo,cdemo

   Note that only the group

   root has a password!

  The third field contains the group id.

   root:X:0:root,admin,oper

   other:X:1:

   cron:X:2:cron

   bin:X:3:bin,who,michael,dxu,dxu2

   uucp::4:uucp

   user:X:100:yori,michael,jean,anna

   demo::200:guest,vdemo,cdemo

  Note that each group is required 

  to have a distinct group id!

 The fourth field contains the list of 

 login names for valid group members!

   root:root:0:root,admin,oper

   other:X:1:

   cron:X:2:cron

   bin:X:3:bin,who,michael,dxu,dxu2

   uucp::4:uucp

   user:X:100:yori,michael,jean,anna

   demo::200:guest,vdemo,cdemo

  Note that one person may belong to more

  than one group, as is the instance with the

  user michael!