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Full Discussion: tar the symbolic link
Top Forums Shell Programming and Scripting tar the symbolic link Post 302198550 by nua7 on Friday 23rd of May 2008 07:11:23 AM
Old 05-23-2008
Normally, when tar archives a symbolic link, it writes a record to the archive naming the target of the link. In that way, the tar archive is a faithful record of the filesystem contents. `--dereference' (`-h') is used with `--create' (`-c'), and causes tar to archive the files symbolic links point to, instead of the links themselves. When this option is used, when tar encounters a symbolic link, it will archive the linked-to file, instead of simply recording the presence of a symbolic link.

The name under which the file is stored in the file system is not recorded in the archive. To record both the symbolic link name and the file name in the system, archive the file under both names. If all links were recorded automatically by tar, an extracted file might be linked to a file name that no longer exists in the file system.

If a linked-to file is encountered again by tar while creating the same archive, an entire second copy of it will be stored. (This might be considered a bug.)

So, for portable archives, do not archive symbolic links as such, and use `--dereference' (`-h'): many systems do not support symbolic links, and moreover, your distribution might be unusable if it contains unresolved symbolic links.
 

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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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