On Xubuntu 14.04.3 LTS I got a black screen after wakeup the machine from suspend mode. This didn’t happen all the time. It was more of a sporadic phenomenon happening after entering the credentials to unlock the machine. Under these circumstances the screen got black and the machine didn’t react on any actions any more. I could got to […]
That’s not as easy as you might think with nano. Mainly because of the stage keystroke-philosophy of nano. Here is the way I cut out multiple lines, whole paragraphs or also huge text blocks with nano (Xubuntu 14.04, MacOS X 10.9.5). Open file in nano: $> nano -c textFileToEdit.txt -c shows line-numbers. Alternatively you can press […]
Dnsmasq is a very handy and easy to install DNS / DHCP server implementation, that uses the local hosts file to determine hostname to IP mappings. I use a local DNS to be able to call my local machines by a memorable domain instead of their IP. Additionally dnsmasq works as an DNS Cache. Installation of dnsmasq […]
To switch you shells keymap on Arch Linux or Ubuntu to another language you can use localectl. You can print the actual settings with the following command: $> localectl status To get a list of possible keymaps use: $> localectl list-keymaps And finally you can set the respective keymap with (de-QUERZ layout in this example): $> […]
Recently I had to reduce the size of many images for uploading  them to a website. Unfortunately I didn’t find any tool like IrfanView on Ubuntu, which I’ve used for such problems in my Windows days. But there is a much smarter way to batch resize images on Linux. You simply can use the convert command from […]
Recently I brought a mp3 player that wasn’t able to shuffle the track through all folders. That’s why I had to bring all tracks to the root directory of the player (flatten directory structure). I did it with the following command, that flattens the whole structure by searching all files in the structure and copying […]
Sometimes I had problems to connect to a server via public key authentication. In most cases I could solve them by setting up the right permissions for the file and path of the authorized_keys file. This can be done as shown below: $> chmod 700 $HOME/.ssh $> chmod 600 $HOME/.ssh/authorized_keys $> chmod go-w $HOME $HOME/.ssh […]
This simple bash script is able to backup all given files and folders to a backup destination. I use it to backup all my Raspberry Pis, Banana Pis and also my notebook to my Synology NAS. Example call: If you want to run it as a crontab, you can use key based authentication (see SSH key […]
To change the permissions of all files and / or folders insight the current folder recursively you can run one of  the following command: $> sudo find . -type d -exec chmod 644 {} \; #all folders get 644 $> sudo find . -exec chmod g+r {} \; #all files and folders get group read rights […]
To change the ownership of all files and folders with a certain group and / or user insight the current folder recursively you can run the following command: $> sudo find . -group OLDGROUP -user OLDUSER -exec chown NEWUSER:NEWGROUP {} \; This way you can set the owning group and / or user.
