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Full Discussion: strange doubt in users
Top Forums UNIX for Dummies Questions & Answers strange doubt in users Post 91756 by rhfrommn on Monday 5th of December 2005 11:15:50 AM
Old 12-05-2005
Looking at the inode level doesn't really change things. The filesystem stores information about the file including the numeric group ID for it in an inode. But that still isn't linked to the user account in a "live" fashion. Once the file is created the information is set. You can change the default group for the owner, but the file (and the inode) still doesn't know about that. You need to use a command like chmod or chgrp to edit that information.

You could use switches on an ls command to get more information about this. Maybe making a test account, homedir, and some files then playing around with it would help make it more clear. For example, in solaris ls -n will print the numeric group and user IDs instead of the names of the group and user. Also -i will print the inode number as part of the long listing.

I'm not sure if that answers your question, but I think it should.
 

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LEARN ABOUT OSX

chgrp

CHGRP(1)						    BSD General Commands Manual 						  CHGRP(1)

NAME

     chgrp -- change group

SYNOPSIS

     chgrp [-fhv] [-R [-H | -L | -P]] group file ...

DESCRIPTION

     The chgrp utility sets the group ID of the file named by each file operand to the group ID specified by the group operand.

     The following options are available:

     -f      The force option ignores errors, except for usage errors and doesn't query about strange modes (unless the user does not have proper
	     permissions).

     -H      If the -R option is specified, symbolic links on the command line are followed.  (Symbolic links encountered in the tree traversal
	     are not followed).

     -h      If the file is a symbolic link, the group ID of the link itself is changed rather than the file that is pointed to.

     -L      If the -R option is specified, all symbolic links are followed.

     -P      If the -R option is specified, no symbolic links are followed.  This is the default. Use -h to change the group ID of a symbolic
	     link.

     -R      Change the group ID for the file hierarchies rooted in the files instead of just the files themselves.

     -v      Cause chgrp to be verbose, showing files as the group is modified.

     The -H, -L and -P options are ignored unless the -R option is specified.  In addition, these options override each other and the command's
     actions are determined by the last one specified.

     The group operand can be either a group name from the group database, or a numeric group ID.  If a group name is also a numeric group ID, the
     operand is used as a group name.

     The user invoking chgrp must belong to the specified group and be the owner of the file, or be the super-user.

DIAGNOSTICS

     The chgrp utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY

     In previous versions of this system, symbolic links did not have groups.

     The -v option is non-standard and its use in scripts is not recommended.

FILES

     /etc/group  group ID file

SEE ALSO

     chown(2), fts(3), group(5), passwd(5), symlink(7), chown(8)

STANDARDS

     The chgrp utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								  March 31, 1994							       BSD
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