Re: [Gnumed-devel] Problems dumping database (Mac limitation on su -c)

[Sebastian Hilbert]

Am Freitag, 27. Mai 2011, 07:31:36 schrieb Jim Busser:


Aufruf: chown [OPTION]... [EIGENTÜMER][:[GRUPPE DATEI...

So it does accept ':'

however it seems to be the .group part is added automatically and does not 
make much sense. I doubt there is a group called djb

setting explicetly the group as in djb:users might help.

You might want to check which groups djb is in.

Sebastian


> The failure of my backup script line
> 
>       chown ${BACKUP_OWNER} ${BACKUP_FILENAME}.tar
> 
> resulted (while regular user) on Mac OS in
> 
>       chown: djb.djb: Invalid argument
> 
> and (while root) in
> 
>       chown: root.root: Invalid argument
> 
> seems a function of the script using the chown syntax "dot" delimiter
> 
>       owner[.group]
> 
>  whereas Mac requires the colon delimiter
> 
>       owner[:group]
> 
> See "COMPATIBILITY" comment below in my Mac OS output of man chown.
> 
> Can Debian / Linux / WIndows accept a script revision delimiting instead
> with colon ":"
> 
> ??
> 
> ***************************************************************************
> **********
> 
> NAME
>      chown -- change file owner and group
> 
> SYNOPSIS
>      chown [-fhv] [-R [-H | -L | -P]] owner[:group] file ...
>      chown [-fhv] [-R [-H | -L | -P]] :group file ...
> 
> DESCRIPTION
>      The chown utility changes the user ID and/or the group ID of the
> specified files.  Symbolic links named by arguments are silently left
> unchanged unless -h is used.
> 
>      The options are as follows:
> 
>      -f      Don't report any failure to change file owner or group, nor
> modify the exit status to reflect such failures.
> 
>      -H      If the -R option is specified, symbolic links on the command
> line are followed.  (Symbolic links encountered in the tree traver- sal
> are not followed.)
> 
>      -h      If the file is a symbolic link, change the user ID and/or the
> group ID of the link itself.
> 
>      -L      If the -R option is specified, all symbolic links are
> followed.
> 
>      -P      If the -R option is specified, no symbolic links are followed.
>  Instead, the user and/or group ID of the link itself are modi- fied. 
> This is the default. Use -h to change the user ID and/or the group of
> symbolic links.
> 
>      -R      Change the user ID and/or the group ID for the file
> hierarchies rooted in the files instead of just the files themselves.
> 
>      -v      Cause chown to be verbose, showing files as the owner 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 com-
> mand's actions are determined by the last one specified.
> 
>      The owner and group operands are both optional; however, at least one
> must be specified.  If the group operand is specified, it must be preceded
> by a colon (``:'') character.
> 
>      The owner may be either a numeric user ID or a user name.  If a user
> name is also a numeric user ID, the operand is used as a user name. The
> group may be either a numeric group ID or a group name.  If a group name
> is also a numeric group ID, the operand is used as a group name.
> 
>      For obvious security reasons, the ownership of a file may only be
> altered by a super-user.  Similarly, only a member of a group can change a
> file's group ID to that group.
> 
> DIAGNOSTICS
>      The chown utility exits 0 on success, and >0 if an error occurs.
> 
> COMPATIBILITY
>      Previous versions of the chown utility used the dot (``.'') character
> to distinguish the group name.  This has been changed to be a colon
> (``:'') character, so that user and group names may contain the dot
> character.
> 
>      On previous versions of this system, symbolic links did not have
> owners.
> 
>      The -v option is non-standard and its use in scripts is not
> recommended.
> 
> LEGACY DESCRIPTION
>      In legacy mode, the -R and -RP options do not change the user ID or
> the group ID of symbolic links.
> 
> SEE ALSO
>      chgrp(1), find(1), chown(2), fts(3), compat(5), symlink(7)
> 
> STANDARDS
>      The chown utility is expected to be IEEE Std 1003.2 (``POSIX.2'')
> compliant.
> 
> HISTORY
>      A chown utility appeared in Version 1 AT&T UNIX.
> 
> BSD                             March 31, 1994                            
> BSD (END)
> 
> 
> 
> -- Jim
> 
> 
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