Replacing A Failed Hard Drive In A Software RAID1 Array

http://www.howtoforge.com/replacing_hard_disks_in_a_raid1_array

Para criar um arquivo morto

dd if=/dev/zero of=10.smk bs=1024 count=$N

onde $N*1024=tamanho em bytes do arquivo necessario.
Use echo 0 >> 10.smk para acrescentar 2 bytes no arquivo.

Format MBR

dd if=/dev/zero of=/dev/hda bs=446 count=1

Copying mass amounts of data over a network with bash, rsync

rsync -ave ssh srcpath user@host:/dstpath

or you could even tar over ssh for super-fast synching and no file list delay by doing a:

tar -cf - /srcpath | ssh -c blowfish-cbc user@host '(cd /dstpath; tar xf -)'

Ref: http://corneliusroot.blogspot.com/2006/12/copying-mass-amounts-of-data-over.html

Zerando a senha da BIOS

# printf "\x2E" | dd bs=1 seek=112 of=/dev/port
# printf "\xFF" | dd bs=1 seek=113 of=/dev/port

O "printf" converte o texto em hexadecimal no byte correspondente e repassa este byte para o comando dd que por sua vez escreve este byte na porta 0x70 (112) e 0x71(113).

Ref: http://linuxabordo.com.br/blog/jonnyzone.php?title=zerando_resetando_a_bios_pela_linha_de_c

Accelerating OpenSSH connections with ControlMaster

Add this lines to ~/.ssh/config:


Host *
ControlMaster auto
ControlPath ~/.ssh/master-%r@%h:%p


Referência: http://www.linux.com/articles/54498

Shell Obfuscator

http://comp.eonworks.com/scripts/obfsh