If you get this error message when trying to update the system (see example below) or just pinging an external host … $> sudo pacman -Syu :: Synchronizing package databases… error: failed retrieving file ‘core.db’ from mirror.archlinuxarm.org : Could not resolve host: mirror.archlinuxarm.org error: failed to update core (download library error) error: failed retrieving file ‘extra.db’ […]
A very nice and really working recovery tool is  PhotoRec. It’s a very cool commandline tool for Linux which is able to recover all images on a SD or MMC card that have been deleted accidentally. In my case my fingers where faster than my brain and so I had kicked three rally awesome images :-/. […]
Setup an static IP on Arch Linux can be done by placing a config file in /etc/netctl/: $> sudo nano eth0-Valhalla As you can see, you have to install sudo first. Otherwise you have to switch to root user (su). In the file you have to place the following lines for example: Description=’Valhalla at home eth0′ […]
The following steps are showing how I did setup my wireless connection with an static IP on my ArchLinux driven RaspberryPi. You need to have installed sudo to uses this instructions: Update all packages: $> sudo pacman -Syu Install dialog package: $> sudo pacman -S dialog Install wpa_supplicant package $> sudo pacman -S wpa_supplicant Run wifi-menu: […]
If you want to see, what a process does, you can use: $> strace -p PROCESSID This will show you all actions of the process in realtime. To get a process id you can use the ps-command.
$> ps waux –sort=-pcpu If you piped the result into the head command, you can limit the result to the n entries with the highest CPU usage. $> ps waux –sort=-pcpu | head -n 10 In this example you will see the ten most CPU-consuming processes on the machine. The ‘–‘ before pcpu results in […]
Sometimes you don’t want to get any notifications from your cronjob, but somewhere in the code someone echos something and so you get an email each time. That could be very annoying. The following snipped will help you to immobilize the cron. */5 * * * * /var/wwww/whatever.php > /dev/null 2>&1 The important part is > […]
Therefore we use wget: wget -O outputfile.txt –user sheldon –ask-password https://ask-sheldon.com/genius-stuff.html # f.e. REST wget –http-user USER –http-password PASSWOR http://ask-sheldon.com/import.txt # HTACCESS protection If you let -O param out the output will be stored under its original name.
To delete all content from current position to the end of file on bash, you can take the following steps: Open file in vi or vim $> vi fiele $> # or $> vim file Switch to visual block mode Ctrl+v Press G (Shift+g) Mark text to delete with arrow keys top and down or just press […]
On Debian based Linux distributions you can get the MAC address of the respective network adapter from the filesystem like shown below: $> cat /sys/class/net/wlan0/address # WLAN adapter $> 81:82:83:4:85:86 $> cat /sys/class/net/eth0/address # LAN adapter $> 1a:1b:1c:1d:1e:1f As you can see, all adapters have their own folder under /sys/class/net/ that contains  a address file with the corresponding MAC […]
