February 2015 | Bravehartk2's Blog

Set static IP

26th February 201523rd March 2015 Sheldon1 Comment

Sometimes its necessary that your machine gets a static IP-address. For example if you want to run a server or a other service on that machine. On Debian based machines you can do this by: Edit /etc/network/interfaces (f.e.: with nano)

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address 192.168.88.6
        netmask 255.255.255.0
        gateway 192.168.88.1

auto wlan0
allow-hotplug wlan0
iface wlan0 inet static
        address 192.168.99.6
        netmask 255.255.255.0
        gateway 192.168.88.1
        wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet dhcp

auto lo

iface lo inet loopback

auto eth0

iface eth0 inet static

address 192.168.88.6

netmask 255.255.255.0

gateway 192.168.88.1

auto wlan0

allow-hotplug wlan0

iface wlan0 inet static

address 192.168.99.6

netmask 255.255.255.0

gateway 192.168.88.1

wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet dhcp

In this case we set the IP fix to 192.168.88.6 for both wlan and ethernet. Setup […]

Nice app to interact with your Arduino YUN

25th February 201524th March 2015 SheldonNo Comments

That’s very useful if you want to control your robot via wireless lan (Remote Control): https://sites.google.com/site/fabboco/home/arduino-manager-for-iphone-ipad https://itunes.apple.com/us/app/arduino-manager/id497240094?ls=1&mt=8

Shred files – securely delete files, folders or partitions

25th February 201513th May 2016 Sheldon2 Comments

To shred files or partitions securely:

$> shred -vun <loops> <File1> <File2> 
$> shred -vzn <loops> <Device>

1 2	$> shred -vun <loops> <File1> <File2> $> shred -vzn <loops> <Device>

loop is the count of the loop beginning with 0 (3 means 4-times)!!! You can get the partition table as described in List of partitions or List, partitioning and format drives. If you want to shred a directory recursively, you have to use find:

$> find PATH/TO/FOLDER -type f -exec shred -vun 100 {} \;

1	$> find PATH/TO/FOLDER -type f -exec shred -vun 100 {} \;

This shreds all files in PATH/TO/FOLDER […]

List, partitioning and format drives

24th February 201521st March 2015 Sheldon2 Comments

List all devices:

$> sudo fdisk -l

1	$> sudo fdisk -l

That will give you an overview about all your drives like that:

Disk /dev/sda: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000d9f0d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      499711      248832   83  Linux
/dev/sda2          501758   500117503   249807873    5  Extended
/dev/sda5          501760   500117503   249807872   8e  Linux LVM

Disk /dev/mapper/ubuntu--vg-root: 247.3 GB, 247325523968 bytes
255 heads, 63 sectors/track, 30068 cylinders, total 483057664 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table

Disk /dev/mapper/ubuntu--vg-swap_1: 8468 MB, 8468299776 bytes
255 heads, 63 sectors/track, 1029 cylinders, total 16539648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table

Disk /dev/mmcblk0: 15.9 GB, 15931539456 bytes
255 heads, 63 sectors/track, 1936 cylinders, total 31116288 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

        Device Boot      Start         End      Blocks   Id  System
/dev/mmcblk0p1            8192    31116287    15554048    c  W95 FAT32 (LBA)

Disk /dev/sda: 256.1 GB, 256060514304 bytes

255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x000d9f0d

Device Boot Start End Blocks Id System

/dev/sda1 * 2048 499711 248832 83 Linux

/dev/sda2 501758 500117503 249807873 5 Extended

/dev/sda5 501760 500117503 249807872 8e Linux LVM

Disk /dev/mapper/ubuntu--vg-root: 247.3 GB, 247325523968 bytes

255 heads, 63 sectors/track, 30068 cylinders, total 483057664 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table

Disk /dev/mapper/ubuntu--vg-swap_1: 8468 MB, 8468299776 bytes

255 heads, 63 sectors/track, 1029 cylinders, total 16539648 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table

Disk /dev/mmcblk0: 15.9 GB, 15931539456 bytes

255 heads, 63 sectors/track, 1936 cylinders, total 31116288 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x00000000

Device Boot Start End Blocks Id System

/dev/mmcblk0p1 8192 31116287 15554048 c W95 FAT32 (LBA)

Format drive:

$> sudo fdisk /dev/mmcblk0p1

1	$> sudo fdisk /dev/mmcblk0p1

This will ask you for a command (help will show you all commands):

Command (m for help): help
h: unknown command
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): help

h: unknown command

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the dos compatibility flag

d delete a partition

l list known partition types

m print this menu

n add a new partition

o create a new empty DOS partition table

p print the partition table

q quit without saving changes

s create a new empty Sun disklabel

t change a partition's system id

u change display/entry units

v verify the partition table

w write table to disk and exit

x extra functionality (experts only)

Format FAT32:

$> sudo mkfs.vfat /dev/mmcblk0p1

1	$> sudo mkfs.vfat /dev/mmcblk0p1

Sort directory listing after name

24th February 201523rd March 2015 SheldonNo Comments

You can get a sorted list of directory items with a combination of the ls- and sort- command:

$> ls -al | sort -nk9,9

1	$> ls -al \| sort -nk9,9

With k you can define the column(s) (here 9 till 9) to use for sorting. The parameter n results in a numeric sorting.

Make XML looking nice (xmllint)

20th February 201523rd March 2015 SheldonNo Comments

$> cat products_delta.xml | xmllint --format - > products_delta_lint.xml

1	$> cat products_delta.xml \| xmllint --format - > products_delta_lint.xml

Attention: Don’t use the same file as source and destination! That will result in an empty file!

Cleanup Ubuntu

20th February 201524th March 2015 SheldonNo Comments

In the last time I had the problem, that my system became very slow and wasn’t usable anymore. Here are the steps I’ve taken to get rid of this problem: Cleanup old packages in the terminal:

$> sudo synaptic

1	$> sudo synaptic

got to Settings -> Preferences -> Files activate the bullet point Delete downloaded files after installation under Temporary Files press […]

Stop blinking of the green led

14th February 201529th March 2015 SheldonNo Comments

You can do this on the shell:

$> sudo su -
$> sudo echo none > /sys/class/leds/green:ph24:led1/trigger
$> exit

$> sudo su -

$> sudo echo none > /sys/class/leds/green:ph24:led1/trigger

$> exit

Install community channel

11th February 201524th March 2015 SheldonNo Comments

Sometimes it is necessary to install the community channel manually. F.e. in EE. 1.14.0.1 I got the following error massage in the Magento-Connect-Manager shell when I tried to install a package via “Direct package file upload”:

CONNECT ERROR: The 'community' channel is not installed. Please use the MAGE shell script to install the 'community' channel.

1	CONNECT ERROR: The 'community' channel is not installed. Please use the MAGE shell script to install the 'community' channel.

What I had to do is to run the following commands on shell:

$> # go to magento root folder
$> cd /pathtomageroot 
$> # make mage shell script executable
$> chmod 777 mage 
$> # run the setup
$> ./mage mage-setup

$> # go to magento root folder

$> cd /pathtomageroot

$> # make mage shell script executable

$> chmod 777 mage

$> # run the setup

$> ./mage mage-setup

After that you should see […]

Bravehartk2's Blog

- next level braining -

Month: February 2015

Set static IP

Nice app to interact with your Arduino YUN

Shred files – securely delete files, folders or partitions

List, partitioning and format drives

Sort directory listing after name

Make XML looking nice (xmllint)

Cleanup Ubuntu

Stop blinking of the green led

Install community channel

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