Mailbag

Howard Dyckoff · anti-spyware

Subject: Six Years Old And Still Causing Problems For Linux Users
Date: Wed, 13 Feb 2008 13:56:56 -0500
From: Stephen Russell <srussell@racepointgroup.com>
To: ben@linuxgazette.net

> Found this in the EULA for MSN Messenger accounts:
> 
> """
> Potentially Unwanted Software
> 
> If you remove or disable "spyware", "adware"  and other potentially
> unwanted software ("potentially unwanted software"), it may cause
> other software on your computer to stop working, and it may cause you
> to breach a license to use other software on your computer (such as
> where the other software installed the potentially unwanted software
> on your computer as a condition for your use of the other software).
> By using the features of the service intended to help you remove or
> disable potentially unwanted software, it is possible that you will
> also remove or disable  software that is not potentially unwanted
> software. If a feature of the service prompts you before removing or
> disabling potentially unwanted software, you are solely responsible
> for selecting which potentially unwanted software the service removes
> or disables.  Before authorizing the removal of any potentially
> unwanted software, you should read the license agreements for the
> potentially unwanted software.
> """
> 
> LICENSE AGREEMENTS for spyware???  I'm supposed to recognize what kind
> of spyware has been surreptitiously been installed on my computer, and
> know where its license agreement is?
> 
> Fancy Microsoft discouraging people from eradicating spyware, and
> threatening them with a potential license violation if they do.

  What is Savon? 

  Savon is a program that allows you to store parts of a file system in
  Subversion. It manages file contents, permissions, owner and group (by
  name, not by id), and even SELinux security context. Layers allow re-use
  of files among different hosts.

  The command-line tool, savon, tries to follow svn in spirit as closely
  as possible in expected behaviour, output, ... Of course, there are
  different commands for the additional functionality, but your knowledge
  of svn will carry over into your use of savon. (One important exception
  is the add command, which is non-recursive by default. svn chose to make
  this recursive, in contrast to CVS, and many a user has made the mistake
  of adding a whole subtree to subversion when they just wanted one
  directory added.)

  What can I use it for? 

      * Use it to store configuration files, scripts, and other local
        modifications for your one or more Unix hosts
      * Use it to manage clusters of machines that share roles and can
        thus share configuration from one central repository
      * Use it to store the same type of information from your user
        directory, again allowing you to share parts of these directory
        layouts among multiple machines 

  High-level overview 

  Savon allows you to manage a part of your file system in an overlay.
  This part can be the whole filesystem or root, or your home directory,
  or something else.

  This overlay is split up into one more more layers. The layers are
  stacked top to bottom to represent the tree of revisioned nodes. If a
  node is present in more than one layer, the version in the top-most
  layer is used.

  Typically, you would use a separate overlay for each host, and then
  share common files in a layer. For example, on my home network, but also
  on hosts of family and friends I maintain, I use the bottom-most layer
  for files that should be the same on all hosts. This includes for
  example authorized_keys for ssh, so that I can log in to every machine.
  The layer above that is used for files that are related to the local
  network configuration; for example, yum configuration files pointing to
  local directories.

  The top-level layer gets used for the host-specific files, including
  interface definitions, a host ChangeLog, ...

  Having separate layers thus makes it easy to share configuration and
  files between machines. 

-- 
//MNZ\\

> Some minor tweaks: I got rid of spaces, slashes, etc. in the filename.

tr/A-Za-z0-9/_/cs;

s/^_?(.*?)_?$/$1.html/;

> ---------------------------------------------------------------------------
> #!/usr/bin/perl -w
> # Created by Ben Okopnik on Thu Jan 24 13:39:27 EST 2008
> 
> use strict;
> 
> die "Usage: ", $0 =~ /([^\/]+)$/, " <html_file[s]_to_rename>\n"
>   unless @ARGV;
> 
> my $title;
> 
> for (@ARGV) {
>     open(F, $_) or die "$_: $!\n";
>     {
>         local $/;
>         ($title) = <F> =~ /<title>\s*([^<\n]+)/i;
>     }
>     close(F);
> 
>     if ($title) {
>         $title .= ".html";
>         $title =~ s!/!-!g;
>         $title =~ s/\s/-/g;
>         $title =~ s/-&-/-and-/g;
>         $title =~ s/--*/-/g;
>         $title =~ s/-\././g;
>         $title =~ s/[:,.]-/-/g;
>         $title =~ tr/'";//d;
>     }
>     else {
>         warn "$_: no title\n";
>         next;
>     }
> 
>     if (-f "$title") {
>         warn "'$title' already exists\n";
>     }
>     else {
>         print "$_ -> $title\n";
>         rename($_, "$title") or die "rename $_: $!\n";
>     }
> }
> 
> exit(0);

-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *

$ cd /media/sda5/Writings\ \&\ Presentations/Book Reviews

bash: cd: /media/sda5/Writings & Presentations/Book: No such file or directory

$ cd /media/sda5/Writings\ \&\ Presentations/"Book Reviews"

-- 
Amit Kumar Saha
*NetBeans Community
Docs Coordinator*
Writer, Programmer, Researcher
http://amitsaha.in.googlepages.com
http://amitksaha.blogspot.com

class abc {
  public :
     virtual void if_method1()=0;
     virtual long if_method2()=0;
     virtual bool if_method3()=0;
     ...
};

abc *abc_factory_new();
void abc_factory_delete(abc *);

int main() {
  abc *a = new abc();
  delete a;
}

Subject: RSS feed problem
Date: Tue, 5 Feb 2008 08:24:52 -0500
From: Bob McConnell <rvm@CBORD.com>
To: editor@linuxgazette.net

-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *

-- 
Name : Suramya Tomar
Homepage URL: http://www.suramya.com

> If you're willing, we could also set up a call to discuss or 
> alternatively use IRC ?
> There's way too many options depending on setup discussion etc.

> We've been through 4 generations of storage architecture including 
> on-line but off-site backup.

main()
{
    fork();
    printf("\n my id=%d and and my parent id=%id",getpid(),getppid());

      fork();
    printf("\n my id=%d and and my parent id=%id",getpid(),getppid());

}

-- 
//MNZ\\

> Hi,
>
> In my project I am going to send newsletters to our clients. Here I need to
> validate my newsletter(content). Also I need to show the content's Spam
> score. I need to check the spam score for only body content not header. I
> have tried with Mail-Spamassassin-3.2.4, the SA is written in Perl API. The
> SA will check the both header and body content like ,
>
> .ie n .IP "$score = $status\fR\->\fIget_head_only_points()" 4
> .el .IP "$score = \f(CW$status\fR\->\fIget_head_only_points()\fR" 4
> .IX Item "$score = $status->get_head_only_points()"
> Return the message's score as computed for auto\-learning, ignoring
> all rules except for header-based ones.
> .ie n .IP "$score = $status\fR\->\fIget_learned_points()" 4
> .el .IP "$score = \f(CW$status\fR\->\fIget_learned_points()\fR" 4
> .IX Item "$score = $status->get_learned_points()"
> Return the message's score as computed for auto\-learning, ignoring
> all rules except for learning-based ones.
> .ie n .IP "$score = $status\fR\->\fIget_body_only_points()" 4
> .el .IP "$score = \f(CW$status\fR\->\fIget_body_only_points()\fR" 4
> .IX Item "$score = $status->get_body_only_points()"*
> *
>
> I've been your topic "Fine-tuning SpamAssassin" in
> http://linuxgazette.net/authors/youngman.html

Date: Sun, 24 Feb 2008 15:09:19 +0000
From: lee hughes <toxicnaan@gmail.com>
To: kapil@imsc.res.in
Subject: tkb:Device Mapper?

==================
#!/bin/sh

umount /backup
lvremove backuplv
vgremove cryptvg
cryptsetup remove crypt1
cryptsetup remove crypt2
==================

>
> Hello:
>
> I just wanted you to know that I am sending you this email thru your
> configuration settings on your SMTP Auth for Postfix page.
>
> Squid configurationry much for writing a clear, concise page for a issue that can
> be clear as mud on Linux/Unix MTA's.  I am relaying thru my (new) canadian
> ISP SMTP servers without issue, and I did not know how to set this up
> before..
>
> I just wanted you to know your efforts are not in vain!

> I,ve read your article about measuring tcp congestion window. Maybe I
> can ask you, how to use tcp_info structure in my Apache code (more
> specifically in sendfile_it_all function in core_filters.c. I want to
> get the time to transfer last byte sent in order to schedule the
> packet sent to client according to that metric), cause I really realy
> confused with the Apache source code. Or, do you know what part in
> Apache that provide the time to transfer last by sent to client.

getsockopt( tcp_work_socket, SOL_TCP, TCP_INFO, (void *)&tcp_info,
&tcp_info_length );

> Some minor tweaks: I got rid of spaces, slashes, etc. in the filename.

tr/A-Za-z0-9/_/cs;

s/^_?(.*?)_?$/$1.html/;

> ---------------------------------------------------------------------------
> #!/usr/bin/perl -w
> # Created by Ben Okopnik on Thu Jan 24 13:39:27 EST 2008
> 
> use strict;
> 
> die "Usage: ", $0 =~ /([^\/]+)$/, " <html_file[s]_to_rename>\n"
>   unless @ARGV;
> 
> my $title;
> 
> for (@ARGV) {
>     open(F, $_) or die "$_: $!\n";
>     {
>         local $/;
>         ($title) = <F> =~ /<title>\s*([^<\n]+)/i;
>     }
>     close(F);
> 
>     if ($title) {
>         $title .= ".html";
>         $title =~ s!/!-!g;
>         $title =~ s/\s/-/g;
>         $title =~ s/-&-/-and-/g;
>         $title =~ s/--*/-/g;
>         $title =~ s/-\././g;
>         $title =~ s/[:,.]-/-/g;
>         $title =~ tr/'";//d;
>     }
>     else {
>         warn "$_: no title\n";
>         next;
>     }
> 
>     if (-f "$title") {
>         warn "'$title' already exists\n";
>     }
>     else {
>         print "$_ -> $title\n";
>         rename($_, "$title") or die "rename $_: $!\n";
>     }
> }
> 
> exit(0);

-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *

1. Your method of binding the C-\ key to command might cause you
   grief. The suggested method is "escape ^\\".

   You can also bind a "function key" to the screen command with
   something like "bindkey -k <keyname> command". The list of
   <keyname>s can be found in "man -s5 termcap" under the section
   "String Capabilities". I use "F1" which is the F11 key. (It should
   have been F12 but that is for the window manager).

   You can also use some command like "escape ^^^" to
   override the default C-a being bound to the escape key.
   There currently seems to be no way to specify "no escape key" to
   screen which is a bit unfortunate!

2. You can also use "C-a '<initial char(s) of window name>" to switch
   to a window for example "C-a 'Eli" followed by enter will switch
   to that window.

-- 
Jon Schewe | http://mtu.net/~jpschewe
If you see an attachment named signature.asc, this is my digital
signature.
See http://www.gnupg.org for more information.
For I am convinced that neither death nor life, neither angels 
nor demons, neither the present nor the future, nor any 
powers, neither height nor depth, nor anything else in all 
creation, will be able to separate us from the love of God that 

-- 
"And as imagination brings forth the forms of things unknown, the Magician's
Will turns them to shapes, and gives to airy nothing a local habitation and
a name."

dd if=3D/dev/hda of=3D/mnt/usb/big_dump.img

losetup /dev/loop0 /mnt/usb/big_dump.img
kpartx -a /dev/loop0

kpartx -d /dev/loop0

Quoting Don Marti:

> Dick Morrell on the impact on Zimbra:
>  http://blog.dickmorrell.org/?p=532 
> 
> Wikipedia article on the future of Zimbra:
>  http://en.wikipedia.org/wiki/FoxPro_2 

dd if=/dev/zero of=/mount/point/of/your/partition/testfile bs=4K count=256M

autocmd FileType perl nmap K "zyiw<c-W>n:set buftype=nofile<CR>:r!
    \perldoc -tf '<c-R>z' 2>/dev/null <bar><bar> perldoc '<c-R>z'<cr>gg

-- 
* Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET *

#!/bin/bash

for b in *; do (  cd $b; for a in *; do mv -v "$a" $(echo $a | sed s/\
/\_/g); done ) ; done

#!/bin/bash

for b in *;
do ( cd $b;
     for a in *;
            do test=$(echo $a | cut -f1 -d\.).wav ;
            mpg123 -v -w $test "$a";
            oggenc  $test ;
            rm -fv $test ;  rm -fv "$a" ;
     done );
done

[root@localhost ~]# fdisk /dev/sdb

Disk /dev/sdb: 120.0 GB, 120034123776 bytes
255 heads, 63 sectors/track, 14593 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1         200     1020096   8e  Linux LVM
/dev/sdb2             201         400     1020096   8e  Linux LVM

[root@localhost ~]# partprobe

[root@localhost ~]# pvcreate /dev/sdb1 /dev/sdb2
	Physical volume "/dev/sdb1" sucessfully created
	Physical volume "/dev/sdb2" sucessfully created

[root@localhost ~]# vgcreate VolumeGroup_1 /dev/sdb1
	Volume group "VolumeGroup_1" successfully created

 [root@localhost ~]# vgdisplay
    --- Volume group ---
  VG Name           	 	  	 VolumeGroup_1
  System ID             
  Format               			 lvm2
  Metadata Areas       	 		 1
  Metadata Sequence No 	 		 1
  VG Access            			 read/write
  VG Status            			 resizable
  MAX LV             			 0
  Cur LV               			 0
  Open LV               		 0	
  Max PV                		 0
  Cur PV                		 1
  Act PV                		 1
  VG Size               		 476.00 MB
  PE Size               		 4.00 MB
  Total PE              		 119
  Alloc PE / Size       		 0 / 0
  Free  PE / Size       		 119 / 476.00 MB
  VG UUID                  	     BCkPP1-2CM1-1hxW-7B2J-yfSt-mEMJ-7fMwNL

[root@localhost ~]# lvcreate -l 50 -n LogicalVolume_1 /dev/VolumeGroup_1 
	Logical volume "LogicalVolume_1"  created

[root@localhost ~]# mkfs.ext3 /dev/VolumeGroup_1/LogicalVolume_1

[root@localhost ~]# e2label /dev/VolumeGroup_1/LogicalVolume_1 /data

[root@localhost ~]# mkdir /data
[root@localhost ~]# mount /dev/VolumeGroup_1/LogicalVolume_1 /data 
[root@localhost ~]# ls /data 
lost+found

[root@localhost ~]# cd /data
[root@localhost data]# dd if=/dev/zero of=crap bs=1000k  count=190
190+0 records in 
190+0 records out
194560000 bytes (195 MB) copied, 16.2202 seconds, 12.0 MB/s

[root@localhost data]# df -h 
Filesystem            Size    Used   Avail Use% Mounted on
/dev/sda8             965M    302M   614M   33%      /
/dev/sda1              99M    5.9M    88M    7%      /boot
tmpfs                 629M       0   629M    0%      /dev/shm
/dev/sda7             965M    618M   298M   68%      /home
/dev/sda5             9.5G    3.1G   6.0G   34%      /usr
/dev/sda2              19G    8.6G   9.5G   48%      /var
/dev/mapper/VolumeGroup_1-LogicalVolume_1 
                      194M    192M      0  100%      /data

[root@localhost data]# lvresize -l 100 /dev/VolumeGroup_1/LogicalVolume_1
	Extending logical volume LogicalVolume_1 to 400.00 MB
	Logical volume Log_1 successfully resized

[root@localhost data]# resize2fs /dev/VolumeGroup_1/LogicalVolume_1 
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/VolumeGroup_1/LogicalVolume_1 is mounted on /data; on-line resizing required
Performing an on-line resize of /dev/VolumeGroup_1/LogicalVolume_1 to 409600 (1k) blocks 
The filesystem on /dev/VolumeGroup_1/LogicalVolume_1 is now 409600 blocks long.

[root@localhost data]# df -h
Filesystem            Size    Used   Avail Use% Mounted on
/dev/sda8             965M    302M   614M   33%      /
/dev/sda1              99M    5.9M    88M    7%      /boot
tmpfs                 629M       0   629M    0%      /dev/shm
/dev/sda7             965M    618M   298M   68%      /home
/dev/sda5             9.5G    3.1G   6.0G   34%      /usr
/dev/sda2              19G    8.6G   9.5G   48%      /var
/dev/mapper/VolumeGroup_1-LogicalVolume_1 
                      388M    193M   175M   53%      /data

[root@localhost data]# vgextend /dev/VolumeGroup_1 /dev/sdb2
	Volume group "VolumeGroup_1" successfully extended

[root@localhost data]# vgdisplay 
    --- Volume group ---
  VG Name           	 	  	 VolumeGroup_1
  System ID             
  Format               			 lvm2
  Metadata Areas       	 		 2
  Metadata Sequence No 	 		 4
  VG Access            			 read/write
  VG Status            			 resizable
  MAX LV             			 0
  Cur LV               			 1
  Open LV               		 1	
  Max PV                		 0
  Cur PV               			 2
  Act PV                		 2
  VG Size               		 952.00 MB
  PE Size               		 4.00 MB
  Total PE              		 238
  Alloc PE / Size       		 100  / 400.00 MB
  Free  PE / Size       		 138  / 552.00 MB
  VG UUID                        BCkPP1-2CM1-1hxW-7B2J-yfSt-mEMJ-7fMwNL

Commands:
	fdisk ----- partitions hard disk 
	partprobe - force the kernel to reread the partition table
	pvcreate -- creates physical volumes
	pvdisplay - display details about physical volumes
	vgcreate -- creates volume groups
	vgdisplay - display details about volume groups
	vgextend -- extends volume group	
	lvcreate -- creates logical volumes
	lvdisplay - display details about logical volumes
	lvextend -- extends logical volume
	lvresize -- resize logical volume
	resize2fs - expands filesystem onto newly extended space

             mkdir /usr/src/Logger
             mv Logger.tgz /usr/src/Logger
             cd /usr/src/Logger
             tar xvzf Logger.tgz

             ./COMPILE

March 2008 (#148):

Mailbag

This month's answers created by:

Our Mailbag

Six Years Old And Still Causing Problems For Linux Users

Unwanted software

Version control for /etc

Can't get /dev/eth0

renaming HTML files

Space in Directory Names

Squid configuration

G++ too clever by half

RSS feed problem

Restrict the number of files a user can delete at a time

Followup: coraid

question regarding fork() system call

Talkback

Talkback:147/rowe.html

Talkback:147/franci.html

Talkback:105/youngman.html

Talkback:114/kapil.html (2)

Talkback:140/pfeiffer.html

Talkback:142/pfeiffer.html

Talkback:136/pfeiffer.html

Talkback:issue84/okopnik.html

Talkback:147/appaiah.html

Talkback:135/pfeiffer.html

Talkback:147/john.html

Talkback:147/lg_mail.html

Talkback:137/lazar.html - Linux mint network issue

Talkback:114/kapil.html

NewsBytes

News in General

SCO may return from the Dead

HP Promotes Open Source Software Governance

INTEL Spearheads Fibre Channel over Ethernet

Events

Distros

PostgreSQL 8.3 released

Firefox 3 Beta 3 available for download

Mozilla Messaging also launched

Products

Sun to Acquire VirtualBox Developer innotek

VMware Adds Virtualization Offerings with Acquisition of Thinstall, Foedus

Follow-up Developments in the "Exhibit B" Licensing Issue

Away Mission

SD West Conference

IT Security World 2007

2-Cent Tips

2-cent tip: Getting the "true" transfer rate during disk I/O benchmark

2-cent Tip: Editing Perl scripts in Vim

2-cent tip: Convert your mp3 files into ogg

Joey's Notes: Logical Volume Creation and Expansion

Taking control of system logs -- How to install Logger