Mailbag

Deividson Luiz Okopnik and Howard Dyckoff · Linux Gazette

Date: Sat, 17 May 2008 14:56:19 +0200
From: Benno Schulenberg <[email protected]>
Subject: lang="utf-8" makes Firefox use an ugly font
To: [email protected]

Date: Fri, 16 May 2008 02:21:54 +0800
From: "Triyan W. Nugroho" <[email protected]>
To: [email protected]
Subject: Linux Gazette Indonesia

-- 
Amit Kumar Saha

Rick Moen wrote:

> Quoting Ben Okopnik ([email protected]):
> 
> > Hey, Rick -
> > 
> > I've just been contacted by these people:
> > 
> > http://www.openinventionnetwork.com/
> > 
> > They want to write something for us. [ ... ] What's your take on this?
> 
> They're legit.  I think the main reason they smell funny is that their
> main assets -- the reason for their existence, a set of software patents
> -- inherently smells funny.
> 
> Back in the 1990s, there was a firm called Commerce One, which through
> acquisitions picked up a bunch of patents related to online
> communications, mostly business-to-business and e-commerce stuff.  They
> filed for bankruptcy protection in 2004, and the court approved a sale
> of the patent portfolio to a subsidiary of Novell.
> 
> My impression is that Novell at that point woke up and said "We just
> acquired what?"  They really didn't want to become patent barons, and
> saw from the SCO fiasco that they wanted to keep clear of, and
> preferably disarm, the more scumsucking elements of the "intellectual
> property" ranching business.  So, they talked with IBM, Philips, Red
> Hat, and Sony, and got them all to pitch in patents and money to launch
> Open Invention Network to hold contributed patents (including the
> Commerce One portfolio) and licence them royalty-free to any firm that
> in return promises patent peace towards Linux and a list of
> Linux-related codebases (Apache, Eclipse, Evolution, Fedora Directory
> Server, Firefox, GIMP, GNOME, KDE, Mono, Mozilla, MySQL, Nautilus,
> OpenLDAP, OpenOffice.org, Open-Xchange, Perl, PostgreSQL, Python, Samba,
> SELinux, Sendmail, and Thunderbird).
> 
> There's not a lot that stands absolutely in the way of them turning
> evil, but it's reassuring that Red Hat's Mark Webbink approves of them
> highly.  See:  http://www.dwheeler.com/blog/2006/04/14/#oin
> 
> I hate to lose my cynic credentials, but I'd say you should eagerly
> invite an article submission!
>

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

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

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

> I strongly suspect that it was a case of "Works Fine For Me".

> Quoting Ben Okopnik ([email protected]):
>
>  > I'd like to correct one common misapprehension, though: you don't have
>  > to learn to program in order to use Linux. in fact, the skills you need
>  > to use it are the same ones that you need for using Windows.
>
>  Actually, I think it's time we counter the hoary "you have to be a
>  programmer to use Linux" farrago with a far more credible counter-meme:
>  You really must be a programmer to stand a chance of not being
>  horribly frustrated by MS-Windows.
>
>  Consider how many times we've heard from MS-Windows users that the poor
>  security architecture, corruption-prone registry, spyware-infested
>  proprietary software marketplace, fragile and fragmentation-tending
>  filesystems, and so on have driven them to utter distraction.

-- 
John

> On Tue, May 6, 2008 at 5:31 PM, René Pfeiffer <[email protected]> wrote:
> >  On May 06, 2008 at 0020 +0530, akshay saad appeared and said:
> >  > Hi,
> >  > I was following your article http://linuxgazette.net/136/pfeiffer.html
> >  > (Measuring TCP congestion window).
> >  > What I observed was that  RTT is constant throughout the experiment I
> >  > did with your code .
> >  > I was wondering isn't it suppose to change  ?
> >
> >  It depends on your test environment. What was the network link between
> >  the two hosts? If it was a local link (such as Ethernet) the RTT won't
> >  change much. You need a WAN link (simulated or real) to observe RTT
> >  variations. Unsaturated links don't produce very little RTT variations.
> >
> I did tried that on intercontinental network. But I can access
> network only through proxy server of my college. Does that create a
> difference ?

=> "no3d".

>
>  > >  And, finally, corrupted ISO downloads. A friend taught me how to fix
>  > > these: If your ISO is corrupted, it seems like all you have to do to fix
>  > > it is to create/get a torrent of it, stick the corrupted download in the
>  > > directory where the ISO will be downloaded to by default, and let the
>  > > torrent system correct it for you!
>  >
>  > I can't see this working at all.  Were you told this on April 1st?  ;)
>
>  I was, now that I go through my chat logs, but the person who asked me about
>  whether or not I had the file handy for a torrent, and introduced me to this,
>  had previously posted for help for the image he was requesting, a few days
>  before.

-- 
clarjon1

#!/usr/bin/perl
# Thomas Bonham
# Create on 05/27/2008
# Function is for list all contents of a directory

use Cwd;

sub searchdir
{
  my $dir = shift;
  my $cwd = getcwd();
  if ($dir ne "") {
    unless (chdir($dir)) {
      print STDERR "Unable to chdir to $cwd/$dir: $!\n";
      return;
    }
  }
  opendir(DIR, ".");
  my @files = readdir(DIR);
  closedir(DIR);
  foreach my $file (@files) {
    next if $file eq "." || $file eq "..";
    if (-d $file) {
      searchdir($file);
      next;
    }
    # Do what you would like here
    print getcwd(),"/",$file,"\n";
  }
  chdir($cwd);
}
sub main() {
    searchdir();
}

main();

-- 
Clarjon1
Proud Linux User.
PCLinuxOS on Dell Inspiron 1501, 1 Gig RAM, 80 Gig hard drive
1.7GHz AMD Athlon 64bit dualcore processor
Contact:
Gmail/gtalk:  clarjon1
irc: #pclinuxos,#pclinuxos-support,##linux on freenode
QOTD:

$ export TERM=dumb
$ script
<do whatever necessary to be logged>
<type exit or press Ctrl-D>
$ export TERM=xterm
Switch back to vt100, xterm, or other when you're done, to recover your
terminal's original mode.

$ cat -A typescript

mulyadi@mushu:/tmp$ ls^M$
gconfd-mulyadi^I^I  mc-mulyadi^I ssh-tYecBM5768^M$
gedit.mulyadi.3088662139  orbit-mulyadi  Tracker-mulyadi.5855^M$
keyring-HzVeHi^I^I  plugtmp^I typescript^M$
mapping-mulyadi^I^I  sqlGIskW0^I virtual-mulyadi.SGmoJb^M$

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

CREATE TABLE access
(
  access_id serial NOT NULL PRIMARY KEY,
  access_ip text
);

CREATE TABLE hit
(
  hit_id serial NOT NULL PRIMARY KEY,
  hit_value integer
);
insert into hit values(0, 0);
create or replace function add_hit()
returns TRIGGER as $$
begin
	if(TG_OP='INSERT') then
		update hit set hit_value = (select hit_value from hit where hit_id = 0) +1 where hit_id = 0;
	end if;
	return new;
end; 
$$ Language PLPGSQL;
new
new
new
old
old
old
create TRIGGER tg_add_hit before insert on access for each row execute procedure add_hit();

trigger name
before/after
events
for each row
for each
create table product(
pro_id serial primary key,
pro_name varchar(50),
pro_quant integer);

create table sale(
sale_id serial primary key,
sale_value date default current_date);

create table sale_product(
sp_id serial primary key, 
sale_id integer references sale(sale_id),
pro_id integer references product(pro_id), 
sp_quant integer);

insert into product(pro_name, pro_quant) values ('Computer', 10);
insert into product(pro_name, pro_quant) values ('Printer', 15);
insert into product(pro_name, pro_quant) values ('Monitor', 10);
insert into sale(sale_id) values (0);
create or replace function upd_stock()
returns TRIGGER as $$
begin
	if((TG_OP='DELETE') OR (TG_OP='UPDATE')) then
	  update product set pro_quant = pro_quant + OLD.sp_quant where pro_id = OLD.pro_id;
	end if;
	if((TG_OP='UPDATE') OR (TG_OP='INSERT')) then
  	  update product set pro_quant = pro_quant - NEW.sp_quant where pro_id = NEW.pro_id;
	end if;

	if(TG_OP='DELETE') then
		return old;
	else
		return new;
	end if;
end; 
$$ Language PLPGSQL;

create TRIGGER tg_upd_stock before insert or update or delete on sale_product for each row execute procedure upd_stock();
apt-get install gdesklets

[freshrpms]
name=FreshRPMs for Fedora Core $releasever - $basearch
baseurl=http://ayo.freshrpms.net/fedora/linux/$releasever/$basearch/freshrpms
enabled=1
gpgcheck=1
gpgkey=http://freshrpms.net/RPM-GPG-KEY-freshrpms

yum install gdesklet

wget http://www.gdesklets.de/files/gDesklets-0.35.4.tar.bz2
tar jxvf gDesklets-0.35.4.tar.bz2 
cd gDesklets-0.35.4
./configure
make
make install

tar x ...
./configure
make
root
Applications -> accessories
-> gDesklets
hello.tar.gz:
  ->hello/
  ->hello/helloworld.display
  ->hello/hello.png

mkdir hello
cp helloworld.display hello
cp hello.png hello
tar czvf hello.tar.gz hello

ISystem:4zcicmk4botcub7iypo46t2l7-2
processor.tar.gz:
  ->processor/
  ->processor/processor.display

netspeed.tar.gz:
  ->netspeed/
  ->netspeed/netspeed.display

/usr/lib/gdesklets/Controls
ntp
ntp/
  Intp.py
  __init__.py

from libdesklets.controls import Interface, Permission

class Intp(Interface):
    ntp_time = Permission.READ

from libdesklets.controls import Control

from Intp import Intp
from socket import *
import struct
import sys
import time

class ntp(Control, Intp):

    def __init__(self):
        Control.__init__(self)
	pass
    def __get_time(self):
     	Server = ''
	EPOCH = 2208988800L
	Server = '0.fedora.pool.ntp.org'
	client = socket( AF_INET, SOCK_DGRAM )
	data = '\x1b' + 47 * '\0'
       	client.sendto( data, ( Server, 123 ))
       	data, address = client.recvfrom( 1024 )
       	if data:
        	t = struct.unpack( '!12I', data )[10]
           	t -= EPOCH
          	return time.ctime(t)
    ntp_time=  property(__get_time, doc = "the current time")     

def get_class():
	return ntp

ntptest.tar.gz:
  ->ntptest/
  ->ntptest/ntptest.display

    void __cyg_profile_func_enter(void *func, void *callsite); 
    void __cyg_profile_func_exit(void *func, void *callsite); 

-finstrument-functions
    void __cyg_profile_func_enter( void *func, void *callsite )
    {
        char buf_func[CTRACE_BUF_LEN+1] = {0};
        char buf_file[CTRACE_BUF_LEN+1] = {0}; 
        char buf_args[ARG_BUF_LEN + 1] = {0}; 
        pthread_t self = (pthread_t)0;
        int *frame = NULL;
        int nargs = 0;

        self = pthread_self(); 
        frame = (int *)__builtin_frame_address(1); /*of the 'func'*/

        /*Which function*/
        libtrace_resolve (func, buf_func, CTRACE_BUF_LEN, NULL, 0);

        /*From where.  KO with optimizations. */
        libtrace_resolve (callsite, NULL, 0, buf_file, CTRACE_BUF_LEN);

        nargs = nchr(buf_func, ',') + 1; /*Last arg has no comma after*/ 
        nargs += is_cpp(buf_func);       /*'this'*/
        if (nargs > MAX_ARG_SHOW)
            nargs = MAX_ARG_SHOW;

        printf("T%p: %p %s %s [from %s]\n", 
               self, (int*)func, buf_func, 
               args(buf_args, ARG_BUF_LEN, nargs, frame), 
               buf_file);
    }

    void __cyg_profile_func_exit( void *func, void *callsite )
    {
        long ret = 0L; 
        char buf_func[CTRACE_BUF_LEN+1] = {0};
        char buf_file[CTRACE_BUF_LEN+1] = {0}; 
        pthread_t self = (pthread_t)0;

        GET_EBX(ret); 
        self = pthread_self(); 

        /*Which function*/
        libtrace_resolve (func, buf_func, CTRACE_BUF_LEN, NULL, 0);

        printf("T%p: %p %s => %d\n", 
               self, (int*)func, buf_func, 
               ret);

        SET_EBX(ret); 
    }

libbfd
addr2line
                                \
               +------------+   |
               | arg 2      |   \
               +------------+    >- previous function's stack frame
               | arg 1      |   /
               +------------+   |
               | ret %eip   |   /
               +============+   
               | saved %ebp |   \
        %ebp-> +------------+   |
               |            |   |
               |   local    |   \
               | variables, |    >- current function's stack frame
               |    etc.    |   /
               |            |   |
               |            |   |
        %esp-> +------------+   /

    char *args(char *buf, int len, int nargs, int *frame)
    {
        int i; 
        int offset;

        memset(buf, 0, len); 

        snprintf(buf, len, "("); 
        offset = 1; 
        for (i=0; i<nargs && offset<len; i++) {
            offset += snprintf(buf+offset, len-offset, "%d%s", 
                             *(frame+ARG_OFFET+i), 
                             i==nargs-1 ? " ...)" : ", ");
        }

        return buf; 
    }

    class B {
        ...
        virtual int m1(int i, int j) {printf("B::m1()\n"); f1(i); return 20;}
        ...
    }; 

    080496a2 <_ZN1B2m1Eii>:
     80496a2:    55                       push   %ebp
     80496a3:    89 e5                    mov    %esp,%ebp
     80496a5:    53                       push   %ebx
     80496a6:    83 ec 24                 sub    $0x24,%esp
     80496a9:    8b 45 04                 mov    0x4(%ebp),%eax
     80496ac:    89 44 24 04              mov    %eax,0x4(%esp)
     80496b0:    c7 04 24 a2 96 04 08     movl   $0x80496a2,(%esp)
     80496b7:    e8 b0 f4 ff ff           call   8048b6c <__cyg_profile_func_enter@plt>
     80496bc:    c7 04 24 35 9c 04 08     movl   $0x8049c35,(%esp)
     80496c3:    e8 b4 f4 ff ff           call   8048b7c <puts@plt>
     80496c8:    8b 45 0c                 mov    0xc(%ebp),%eax
     80496cb:    89 04 24                 mov    %eax,(%esp)
     80496ce:    e8 9d f8 ff ff           call   8048f70 <_Z2f1i>
     80496d3:    bb 14 00 00 00           mov    $0x14,%ebx
     80496d8:    8b 45 04                 mov    0x4(%ebp),%eax
     80496db:    89 44 24 04              mov    %eax,0x4(%esp)
     80496df:    c7 04 24 a2 96 04 08     movl   $0x80496a2,(%esp)
     80496e6:    e8 81 f5 ff ff           call   8048c6c <__cyg_profile_func_exit@plt>
     80496eb:    89 5d f8                 mov    %ebx,0xfffffff8(%ebp)
     80496ee:    eb 27                    jmp    8049717 <_ZN1B2m1Eii+0x75>
     80496f0:    89 45 f4                 mov    %eax,0xfffffff4(%ebp)
     80496f3:    8b 5d f4                 mov    0xfffffff4(%ebp),%ebx
     80496f6:    8b 45 04                 mov    0x4(%ebp),%eax
     80496f9:    89 44 24 04              mov    %eax,0x4(%esp)
     80496fd:    c7 04 24 a2 96 04 08     movl   $0x80496a2,(%esp)
     8049704:    e8 63 f5 ff ff           call   8048c6c <__cyg_profile_func_exit@plt>
     8049709:    89 5d f4                 mov    %ebx,0xfffffff4(%ebp)
     804970c:    8b 45 f4                 mov    0xfffffff4(%ebp),%eax
     804970f:    89 04 24                 mov    %eax,(%esp)
     8049712:    e8 15 f5 ff ff           call   8048c2c <_Unwind_Resume@plt>
     8049717:    8b 45 f8                 mov    0xfffffff8(%ebp),%eax
     804971a:    83 c4 24                 add    $0x24,%esp
     804971d:    5b                       pop    %ebx
     804971e:    5d                       pop    %ebp
     804971f:    c3                       ret    

    080498c0 <_ZN1B2m1Eii>:
     80498c0:    55                       push   %ebp
     80498c1:    89 e5                    mov    %esp,%ebp
     80498c3:    53                       push   %ebx
     80498c4:    83 ec 14                 sub    $0x14,%esp
     80498c7:    8b 45 04                 mov    0x4(%ebp),%eax
     80498ca:    c7 04 24 c0 98 04 08     movl   $0x80498c0,(%esp)
     80498d1:    89 44 24 04              mov    %eax,0x4(%esp)
     80498d5:    e8 12 f4 ff ff           call   8048cec <__cyg_profile_func_enter@plt>
     80498da:    c7 04 24 2d 9c 04 08     movl   $0x8049c2d,(%esp)
     80498e1:    e8 16 f4 ff ff           call   8048cfc <puts@plt>
     80498e6:    8b 45 0c                 mov    0xc(%ebp),%eax
     80498e9:    89 04 24                 mov    %eax,(%esp)
     80498ec:    e8 af f7 ff ff           call   80490a0 <_Z2f1i>
     80498f1:    8b 45 04                 mov    0x4(%ebp),%eax
     80498f4:    c7 04 24 c0 98 04 08     movl   $0x80498c0,(%esp)
     80498fb:    89 44 24 04              mov    %eax,0x4(%esp)
     80498ff:    e8 88 f3 ff ff           call   8048c8c <__cyg_profile_func_exit@plt>
     8049904:    83 c4 14                 add    $0x14,%esp
     8049907:    b8 14 00 00 00           mov    $0x14,%eax
     804990c:    5b                       pop    %ebx
     804990d:    5d                       pop    %ebp
     804990e:    c3                       ret    
     804990f:    89 c3                    mov    %eax,%ebx
     8049911:    8b 45 04                 mov    0x4(%ebp),%eax
     8049914:    c7 04 24 c0 98 04 08     movl   $0x80498c0,(%esp)
     804991b:    89 44 24 04              mov    %eax,0x4(%esp)
     804991f:    e8 68 f3 ff ff           call   8048c8c <__cyg_profile_func_exit@plt>
     8049924:    89 1c 24                 mov    %ebx,(%esp)
     8049927:    e8 f0 f3 ff ff           call   8048d1c <_Unwind_Resume@plt>
     804992c:    90                       nop    
     804992d:    90                       nop    
     804992e:    90                       nop    
     804992f:    90                       nop    

$ export CTRACE_PROGRAM=./cpptraced
$ LD_PRELOAD=./libctrace.so ./cpptraced

T0xb7c0f6c0: 0x8048d34 main (0 ...) [from ]
./cpptraced: main(argc=1)
T0xb7c0ebb0: 0x80492d8 thread1(void*) (1 ...) [from ]
T0xb7c0ebb0: 0x80498b2 D (134605416 ...) [from cpptraced.cpp:91]
T0xb7c0ebb0: 0x8049630 B (134605416 ...) [from cpptraced.cpp:66]
B::B()
T0xb7c0ebb0: 0x8049630 B => -1209622540 [from ]
D::D(int=-1210829552)
T0xb7c0ebb0: 0x80498b2 D => -1209622540 [from ]
Hello World! It's me, thread #1!
./cpptraced: done.
T0xb7c0f6c0: 0x8048d34 main => -1212090144 [from ]
T0xb740dbb0: 0x8049000 thread2(void*) (2 ...) [from ]
T0xb740dbb0: 0x80498b2 D (134605432 ...) [from cpptraced.cpp:137]
T0xb740dbb0: 0x8049630 B (134605432 ...) [from cpptraced.cpp:66]
B::B()
T0xb740dbb0: 0x8049630 B => -1209622540 [from ]
D::D(int=-1210829568)
T0xb740dbb0: 0x80498b2 D => -1209622540 [from ]
Hello World! It's me, thread #2!
T#2!
T0xb6c0cbb0: 0x8049166 thread3(void*) (3 ...) [from ]
T0xb6c0cbb0: 0x80498b2 D (134613288 ...) [from cpptraced.cpp:157]
T0xb6c0cbb0: 0x8049630 B (134613288 ...) [from cpptraced.cpp:66]
B::B()
T0xb6c0cbb0: 0x8049630 B => -1209622540 [from ]
D::D(int=0)
T0xb6c0cbb0: 0x80498b2 D => -1209622540 [from ]
Hello World! It's me, thread #3!
T#1!
T0xb7c0ebb0: 0x80490dc wrap_strerror_r (134525680 ...) [from cpptraced.cpp:105]
T0xb7c0ebb0: 0x80490dc wrap_strerror_r => -1210887643 [from ]
T#1+M2 (Success)
T0xb740dbb0: 0x80495a0 D::m1(int, int) (134605432, 3, 4 ...) [from cpptraced.cpp:141]
D::m1()
T0xb740dbb0: 0x8049522 B::m2(int) (134605432, 14 ...) [from cpptraced.cpp:69]
B::m2()
T0xb740dbb0: 0x8048f70 f1 (14 ...) [from cpptraced.cpp:55]
f1 14
T0xb740dbb0: 0x8048ee0 f2(int) (74 ...) [from cpptraced.cpp:44]
f2 74
T0xb740dbb0: 0x8048e5e f3 (144 ...) [from cpptraced.cpp:36]
f3 144
T0xb740dbb0: 0x8048e5e f3 => 80 [from ]
T0xb740dbb0: 0x8048ee0 f2(int) => 70 [from ]
T0xb740dbb0: 0x8048f70 f1 => 60 [from ]
T0xb740dbb0: 0x8049522 B::m2(int) => 21 [from ]
T0xb740dbb0: 0x80495a0 D::m1(int, int) => 30 [from ]
T#2!
T#3!

/etc/crontab
[root@localhost ~]# cat /etc/crontab
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
01 * * * * root run-parts /etc/cron.hourly
02 4 * * * root run-parts /etc/cron.daily
22 4 * * 0 root run-parts /etc/cron.weekly
42 4 1 * * root run-parts /etc/cron.monthly
[root@localhost ~]#

#		Time	      User      Command       Path

01   *   *   *   *    root      run-parts     /etc/cron.hourly
02   4   *   *   *    root      run-parts     /etc/cron.daily
22   4   *   *   0    root      run-parts     /etc/cron.weekly
42   4   1   *   *    root      run-parts     /etc/cron.monthly

          Minute - 0-59.
          Hour - 0-23 24-hour format.
          Day - 1-31 Day of the month.
          Month - 1-12 Month of the year.
          Weekday - 0-6 Day of the week. 0 refers to Sunday.

# min(0-59)    hours(0-23)   day(1-31)   month(1-12)    dow(0-6)   command
   34               2           *            *             *       sh /root/backup.sh

[root@localhost ~]# crontab -e

* * * * * /usr/bin/wall "Hello From Crontab"

crontab: installing new crontab
[root@localhost ~]#

Broadcast message from root (Thu Apr  3 14:52:01 2008):

Hello From Crontab

[root@localhost ~]# crontab -r

[root@localhost ~]# service httpd status
httpd is stopped
[root@localhost ~]# 
[root@localhost ~]# date
Thu Apr  3 15:45:32 MST 2008
[root@localhost ~]#

# min(0-59)    hours(0-23)   day(1-31)   month(1-12)    dow(0-6)   command

   55	          15           *            *		*  	/sbin/service httpd start

55 15 * * * /sbin/service httpd start

[root@localhost ~]# crontab -e 
crontab: Installing new crontab

[root@localhost ~]# crontab -l 
55 15 * * * /sbin/service httpd start

[root@localhost ~]# crontab -r

15,30 * *  5 * /usr/bin/command

12 2 * * 0-2 sh /root/backup.sh

12 */3 * * * sh /root/script.sh

12 */3 * * * sh /root/script.sh >> /root/script.log 2>&1

12 */3 * * * sh /root/script.sh > /dev/null 2>&1

From [email protected]  Thu Apr  3 12:08:01 2008
Date: Thu, 3 Apr 2008 12:08:01 -0700
From: [email protected] (Cron Daemon)
To: [email protected]
Subject: Cron <root@localhost> sh /root/s.sh
Content-Type: text/plain; charset=UTF-8
Auto-Submitted: auto-generated
X-Cron-Env: <SHELL=/bin/sh>
X-Cron-Env: <HOME=/root>
X-Cron-Env: <PATH=/usr/bin:/bin>
X-Cron-Env: <LOGNAME=root>
X-Cron-Env: <USER=root>

test

apt-get install mdadm
dmesg | grep "Attached SCSI"
sd 56:0:0:0: [sde] Attached SCSI removable disk
sd 57:0:0:0: [sdf] Attached SCSI removable disk
sd 58:0:0:0: [sdg] Attached SCSI removable disk
sd 59:0:0:0: [sdh] Attached SCSI removable disk

mdadm --create --verbose /dev/md0 --level=0 --raid-devices=4 /dev/sd{e,f,g,h}
mkfs.ext2 /dev/md0
tune2fs -c 0 -j 0 /dev/md0
mount /dev/md0 /mnt

mdadm --detail /dev/md0
           UUID : d7ea744f:c3963d02:982f0012:7010779c
mdadm --verbose -A /dev/md0 -u d7ea744f:c3963d02:982f0012:7010779c
hdparm -t /dev/md0
dd if=/dev/zero of=/tmp/test2.bin bs=1M count=1024 conv=fsync
seeker /dev/md0
tail -f
  /var/log/messages
> You have nothing to be sorry about, and no reason to feel stupid;
> everything worked exactly as it was supposed to. "Stupid" would be
> beating up on yourself when you've done everything right and achieved a
> good result. 

-- 
Kat Tanaka Okopnik
Linux Gazette Mailbag Editor
[email protected]

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

Test	Description	Results	Comment
hdparm	reading	52 MB/s	This is twice as good as my laptop, and worse than the 70MB/s of my SATA disk in my workstation
dd	writing	28 MB/s	Half of what my workstation disk can do
seeker	random access	0.8-1ms	This is 10-20 times better than an ordinary hard disk

June 2008 (#151):

Mailbag

This month's answers created by:

Gazette Matters

lang="utf-8" makes Firefox use an ugly font

Linux Gazette Indonesia

Our Mailbag

Using Ubuntu 8.04 on Notebook?

"Open Invention Network"

Interesting presentation about the economics of Open Source

Recent Debian SSH vulnerability

Networking Problem on Hardy Heron

Followup: Sendmail and capacity

Talkback

Talkback:108/okopnik.html

Talkback:143/sephton.html

Talkback:150/kapil.html

Talkback:136/pfeiffer.html

Talkback:150/howell.html

Talkback:150/melinte.html

Talkback:150/lg_tips.html

2-Cent Tips

2-cent Tip: Perl Search Directory Function

2-cent Tip: Compiz-Fusion

2-cent Tip: make script command logs without escape character

2-cent Tip: Poisoning the spammers

News Bytes

Contents:

News in General

Wind River joins forces with Intel on Auto Linux

First Moonlight Release

NetBeans Community Links to PHP Community with NetBeans Early Access for PHP

Ubuntu Live 2008 Canceled

OpenSolaris goes LiveCD

HP and Novell offer Migration Program for HP Identity Management Customers

Concordia Project To Tackle Security Policy & Standards at Burton CatalystConference in June

Conferences and Events

Distro News

Fedora 9 is Out!

openSUSE 11.0 Beta 3 to be last

Damn Small Linux v4.4RC1

MEPIS antiX 7.2 released

Software and Product News

Firefox 3 Release Candidate 1 is out

Adobe Flash Player 10 beta released for Linux

Melas v0.10.0

Traffic Control

Sun Unveils New Quad-Core AMD Opteron Systems

Deividson on Databases: Triggers

Triggers

Example 1: Hit Counting

Example 2: Stock/Inventory Control

Conclusion

gDesklets: Beauty with a Purpose

A Quest for Beauty

Installing gDesklets

The gDesklets Framework

A gDesklet Hello, World

Using the Controls in gDesklets

Plotting the Network Usage Graph

Let's create our own control

Conclusion

Reference

Monitoring Function Calls

Overview

Code instrumentation

Binutils and libbfd

Stack Layout

Function arguments

Function return values

Sample output

Resources

Using Crontab

The Basics

Try It

Some more samples

Some tips for using cron:

Commands:

USB thumb drive RAID

Hard Disk Performance