Here goes everything round about operations on the linux filesystem.
Today I had to mount a ssh filesystem under Linux. The reason was, that I had the perception that I would be a very cool idea, to use my old webspace package from all-inkl.com, that I only kept because of the 10 included domains, as a backup storage for my root server.The plan was to […]
This is how to wipe a disk via Linux shell: $> sudo shred -v -n2 -z /dev/sdc The command above erases all data on the device /dev/sdc and overrides the data 2Â times. Finally every bit is overridden by zeros. So in sum it takes 3 iterations to wipe a disk via Linux shell. n specifies […]
Today I had the challenge, that I wanted to copy a DVD and  play it with the VLC media player (http://www.videolan.org/vlc/index.html). Therefore I had to learn how to mount iso file(s) under Linux. In my case it was Ubuntu 16.04.1. (see also my article about how to get your Linux distribution and version). How to […]
To get a list of files that contain a certain term for the current directory you can use this command to find the search query: $> grep -lr SEARCHTERM This shell command searches the current directory recursively (-r) and lists (-l) all files containing the search query SEARCHTERM. SEARCHTERM can also be a regular expression. Example result: […]
Lets imagine you want to search for a term in a file and you want to know, how often it can be found in the file. With this command combination you can count search results on bash: $> less xmlfile.xml | grep SearchmeIfYouCan | wc -l This is how this way to count search results […]
Recently I messed up my life by running this from out of my home folder: $> chmod 600 * Naturally I thought to be in another folder 😉 The result was, that I could not open any programs any more. What was not that nice! 😉 To get out of trouble I had to run […]
If you are working in teams using different operating systems, it could happen, that you get files with unsuitable linefeeds in it. For me as a Linux user the bad guys are normally CRLF’s (Carriage Return and Line Feed @see https://en.wikipedia.org/wiki/Newline). To just convert the CRLF’s in a single file to LF you can use the […]
To rename all jpg-files in a folder to its lower cased equivalent, you can run this little shell script: $> for i in folderpath/*.jpg; do mv -v $i `echo $i | tr ‘[:upper:]’ ‘[:lower:]’`; done The -v param of mv will only give you a list of renamed files.
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 […]
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 […]
