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Full Discussion: changing group ID
Special Forums Hardware Filesystems, Disks and Memory changing group ID Post 302072522 by x96riley3 on Wednesday 3rd of May 2006 04:32:49 PM
Old 05-03-2006
The best way to do this is with PERL. Perl can walk a file system faster than anything else. Do something like this.

#!/opt/perl/bin/perl

use File::Find;
find \&wanted, "/";
sub wanted {

my $dev; # the file system device number
my $ino; # inode number
my $mode; # mode of file
my $nlink; # counts number of links to file
my $uid; # the ID of the file's owner
my $gid; # the group ID of the file's owner
my $rdev; # the device identifier
my $size; # file size in bytes
my $atime; # last access time
my $mtime; # last modification time
my $ctime; # last change of the mode
my $blksize; # block size of file
my $blocks; # number of blocks in a file

#Right below here your telling lstat to retrieve all this info on each and every file/directory. Each and every file/directory is w
ritten to $_.

(($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = lstat($_));

if ($gid <= "99" ) {
$NEWGID=$gid+99;
print "old $gid\n";
print "new $NEWGID\n";
system "chgrp $NEWGID $_;
}
}

I'm not sure if this is perfect but it should be pretty close.

-X
 

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File::stat(3pm) 					 Perl Programmers Reference Guide					   File::stat(3pm)

NAME
File::stat - by-name interface to Perl's built-in stat() functions SYNOPSIS
use File::stat; $st = stat($file) or die "No $file: $!"; if ( ($st->mode & 0111) && $st->nlink > 1) ) { print "$file is executable with lotsa links "; } use File::stat qw(:FIELDS); stat($file) or die "No $file: $!"; if ( ($st_mode & 0111) && $st_nlink > 1) ) { print "$file is executable with lotsa links "; } DESCRIPTION
This module's default exports override the core stat() and lstat() functions, replacing them with versions that return "File::stat" objects. This object has methods that return the similarly named structure field name from the stat(2) function; namely, dev, ino, mode, nlink, uid, gid, rdev, size, atime, mtime, ctime, blksize, and blocks. You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your stat() and lstat() functions.) Access these fields as variables named with a preceding "st_" in front their method names. Thus, "$stat_obj->dev()" corresponds to $st_dev if you import the fields. To access this functionality without the core overrides, pass the "use" an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the "CORE::" pseudo-package. BUGS
As of Perl 5.8.0 after using this module you cannot use the implicit $_ or the special filehandle "_" with stat() or lstat(), trying to do so leads into strange errors. The workaround is for $_ to be explicit my $stat_obj = stat $_; and for "_" to explicitly populate the object using the unexported and undocumented populate() function with CORE::stat(): my $stat_obj = File::stat::populate(CORE::stat(_)); NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this. AUTHOR
Tom Christiansen perl v5.8.0 2002-06-01 File::stat(3pm)
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