Wireless device for HP NoteBooks users who owns ProBook5420s, config

I have HP NoteBooks ProBook5420s. There is a little problem with driver in KUbuntu.

lspci|grep "Network controller:"
44:00.0 Network controller: RaLink RT3090 Wireless 802.11n 1T/1R PCIe

In spite of that the controller is RT3090 it works with rt3390sta driver.
lsmod |grep rt
rt3390sta 1153989 1

My attemts to enable wireless networking with rt3090sta driver were unsaccessfull.

Ram diska creation

Ram diska creation. It is very usefull if you like wardriving:)

# mkdir /tmp/ramdisk; chmod 777 /tmp/ramdisk

# mount -t tmpfs -o size=256M tmpfs /tmp/ramdisk/
or
# mount -t tmpfs tmpfs /tmp/ramdisk -o size=1G,nr_inodes=200k,mode=01777

ZFS Replication. Useful links

ZFS Replication
link
Understanding ZFS: Replication, Archive and Backup
link

bash config to use arrows to scroll history

Insert into .bashrc to turn on using arrows up/down to search in bash history.

bind '"\e[A"':history-search-backward
bind '"\e[B"':history-search-forward
shopt -s cdspell
shopt -s cmdhist
shopt -s histappend
export HISTCONTROL="ignoredups" 

very useful ;-) 

Network backup with NC and TAR

Backup to another host through NetCat command. It can be useful if there is no space for local backup or just for file transfer between hosts.

nc -l -p 8081 >/tmp/nc.dump #just listen on port 8081 and rewrite to stdout

then send something in raw to remote host:

tar c /opt/music | nc -w 2 HOST 8081
cat /tmp/mp3.file | nc -w 2 HOST 8081

-w 2 - wait silence for 2 seconds at stdin of NC and exit
.