To reset a forgotten administrator password

Found this trick on http://4sysops.com/archives/forgot-the-administrator-password-the-sticky-keys-trick/

• Boot from Windows PE or Windows RE and access the command prompt.
• Find the drive letter of the partition where Windows is installed. In Vista and Windows XP, it is usually C:, in Windows 7, it is D: in most cases because the first partition contains Startup Repair. To find the drive letter, type C: (or D:, respectively) and search for the Windows folder. Note that Windows PE (RE) usually resides on X:.
• Type the following command (replace “c:” with the correct drive letter if Windows is not located on C:):
  copy c:\windows\system32\sethc.exe c:\
  This creates a copy of sethc.exe to restore later.
• Type this command to replace sethc.exe with cmd.exe:
  copy /y c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
  Reboot your computer and start the Windows installation where you forgot the administrator password.
• After you see the logon screen, press the SHIFT key five times.
• You should see a command prompt where you can enter the following command to reset the Windows password (see screenshot above):
  net user your_user_name new_password
  If you don’t know your user name, just type net user to list the available user names.
• You can now log on with the new password.

chflags flags access lists mac os x

Pour gérer les flags (attrib) sur mac os x utiliser la commande : chflags

Attention pour certaines options il faut être root

Par exemple pour autoriser le changement de owner :

chflags nouchg filename

Pour voir les flags d'un fichier : ls -lO

DESCRIPTION

   The chflags utility modifies the file flags of the listed files as speci-

   fied by the flags operand.

   The options are as follows:

   -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.)

   -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.

   -R Change the file flags for the file hierarchies rooted in the

   files instead of just the files themselves.

   The flags are specified as an octal number or a comma separated list of

   keywords. The following keywords are currently defined:

   arch, archived

   set the archived flag (super-user only)

   opaque set the opaque flag (owner or super-user only). [Directory

   is opaque when viewed through a union mount]

   nodump set the nodump flag (owner or super-user only)

   sappnd, sappend

   set the system append-only flag (super-user only)

   schg, schange, simmutable

   set the system immutable flag (super-user only)

   uappnd, uappend

   set the user append-only flag (owner or super-user only)

   uchg, uchange, uimmutable

   set the user immutable flag (owner or super-user only)

   hidden set the hidden flag [Hide item from GUI]

   As discussed in chflags(2), the sappnd and schg flags may only be unset   when the system is in single-user mode.
   Putting the letters ``no'' before or removing the letters ``no'' from a   keyword causes the flag to be cleared. For example:
   nouchg clear the user immutable flag (owner or super-user only)   dump clear the nodump flag (owner or super-user only)
   Unless the -H or -L options are given, chflags on a symbolic link always   succeeds and has no effect. 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.
   You can use "ls -lO" to see the flags of existing files.
EXIT STATUS   The chflags utility exits 0 on success, and >0 if an error occurs.
SEE ALSO   ls(1), chflags(2), stat(2), fts(3), symlink(7)
HISTORY   The chflags command first appeared in 4.4BSD.
BUGS   Only a limited number of utilities are chflags aware. Some of these   tools include ls(1), cp(1), find(1), install(1), dump(8), and restore(8).   In particular a tool which is not currently chflags aware is the pax(1)   utility.

activer mode hibernation mise en veille prolongée windows vista

Pour activer la mise en veille prolongée windows vista/seven

powercfg -h on

Mac OS X recover lost password

To reset your OS X password without an OS X CD you need to enter terminal and create a new admin account:

1. Reboot
2. Hold apple + s down after you hear the chime.
3. When you get text prompt enter in these terminal commands to create a brand new admin account :

• mount -uw /
• rm /var/db/.AppleSetupDone
• shutdown -h now

4. After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and you’re good to go again !

---------------------------

Step 1: Start up from a Mac OS X Install CD.

MacOSX-DVD.pngThis hardest part of this technique may be laying your hands on a Mac OS X Install CD when you need one. Use a version that is close the the version of Mac OS X you have installed.

Hold the C key as the computer starts to boot from the CD.

When the installer starts, choose your language, and you'll proceed to the welcome dialog.

Step 2: Choose Reset Password from the Utilities menu.


Tip: In previous versions of Mac OS X (10.2 and 10.3), you can find the Resent Password option under the Installer menu instead.

Step 3: Select your Mac OS X hard disk volume.


Select the user name of your original administrator account.

inittab & event.d & /etc/init

Avec ubuntu 8.04 il n'y a plus de fichier inittab.

C'est remplacé par des scripts placés dans /etc/event.d

Ainsi pour augmenter le nombre de consoles virtuelles il faut placer des scripts tels que :

tty7, tty8, ... dans /etc/event.d

Il semble que event.d est supprimé dans ubuntu à partie de 10.04 : remplacé par /etc/init qui commande upstart.

http://upstart.ubuntu.com/index.html

get directories with sftp/scp

Pour copier des directories avec sftp il faut en fait utiliser scp avec une commande du genre

scp -r -p user@host:/path/to/file/ .

pour copier dans le répertoire courant

perl List::Compare array listes

Pour trouver l'intersection, l'union, le complément, etc. entre deux ou plusieurs listes : utilisation du module perl :

List::Compare

Methods

All the comparison methods available in the Regular case are available to you in the Accelerated case as well.

    @intersection     = $lca->get_intersection;
    @union            = $lca->get_union;
    @Lonly            = $lca->get_unique;
    @Ronly            = $lca->get_complement;
    @LorRonly         = $lca->get_symmetric_difference;
    @bag              = $lca->get_bag;
    $intersection_ref = $lca->get_intersection_ref;
    $union_ref        = $lca->get_union_ref;
    $Lonly_ref        = $lca->get_unique_ref;
    $Ronly_ref        = $lca->get_complement_ref;
    $LorRonly_ref     = $lca->get_symmetric_difference_ref;
    $bag_ref          = $lca->get_bag_ref;
    $LR               = $lca->is_LsubsetR;
    $RL               = $lca->is_RsubsetL;
    $eqv              = $lca->is_LequivalentR;
    $disj             = $lca->is_LdisjointR;
                        $lca->print_subset_chart;
                        $lca->print_equivalence_chart;
    @memb_arr         = $lca->is_member_which('abel');
    $memb_arr_ref     = $lca->is_member_which_ref('baker');
    $memb_hash_ref    = $lca->are_members_which(
                            [ qw| abel baker fargo hilton zebra | ]);
    $found            = $lca->is_member_any('abel');
    $memb_hash_ref    = $lca->are_members_any(
                            [ qw| abel baker fargo hilton zebra | ]);
    $vers             = $lca->get_version;