Linux

Migrating from Owncloud to Nextcloud on Fedora 24

Installing nextcloud on fedora is not trivial as you first need to download the code, install some dependencies and compile it.

git clone https://github.com/nextcloud/client_theming.git
git submodule update --init --recursive
dnf install cmake gcc-c++ openssl-devel sqlite-devel qt5-qtwebkit-devel libqt5keychain-devel
mkdir build-linux
cd build-linux
cmake -D OEM_THEME_DIR=`pwd`/../nextcloudtheme ../client
make
sudo make install

Without installing the dependencies you would get the following error messages:

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Find out what library is missing Fedora 22

Sometimes some libraries are missing. This leads to the following error message:

./command: error while loading shared libraries: abc.so.0: cannot open shared object file: No such file or directory

It will only display the first missing library. So first you can use the following command to identify them:

ldd idaq | grep found

This might lead to the following output, where you can see a list of all missing libraries:

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Run IDA Disassembler on x64 Fedora 22

When executing idaq I got the following error message:

./idaq: error while loading shared libraries: libgthread-2.0.so.0: cannot open shared object file: No such file or directory

This error appeared because I lacked some libraries (32-Bit version). To fix it I had to run the following commands:

dnf install glib2-devel.i686
dnf install freetype.i686
dnf install libSM.i686
dnf install libXrender.i686
dnf install libXext.i686
dnf install fontconfig.i686

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Exact Copies for Backups

In order to create a backup you should first of all make an exact copy

rsync -aHAX --delete /srcfolder /dstfolder

And then also check if the copy is indeed complete and exact:

diff -r /srcfolder /dstfolder

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Create a pdf from pictures

Sometimes I receive scanned documents as numbered jpeg pictures. It would be a lot more handy to have a single pdf file containing all those images. This can easily be done using bash:

convert PartOfTheDocument*.jpg WholeDocument.pdf

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Using SSH to copy files between systems

Copy something from this system to some other system:

scp /path/to/local/file username@hostname:/path/to/remote/file

Copy something from some system to some other system:

scp username1@hostname1:/path/to/file username2@hostname2:/path/to/other/file

Copy something from another system to this system:

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Backup a DVD

The following command can be used to backup/rip a DVD. All files are decrypted and stored in a folder (with the name of the DVD).

dvdbackup -i /dev/dvd -o ./ -M

If you want to create an iso file from those decrypted files you can use the following command:

mkisofs -dvd-video -udf -o ./dvd.iso ./movie_name

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Converting txt to doc

In order to convert textfiles to word documents you can use the following command

abiword --to=doc -o inputfile.doc inputfile.txt

or if you want to convert multiple files:

find *.txt -exec abiword --to=doc -o {}.doc {} \;

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ArchLinux doesn't boot anymore after updating to Gnome 3.8 - Intel Graphics

Yesterday I updated my system to Gnome 3.8. Unfortunately I was not able to boot it anymore. I would only see the boot manager but then It would just hang with a black screen. Switching to a console (Ctrl + Alt + F2) didn't work.

First of all you need to be able to work with your system. The easiest way to achieve that is starting it with runlevel 1.

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Useful Linux Commands

Using mv to prefix files

The following command prefixes all files with the prefix 2013-10-22_. This is useful for small rename operations

for f in * ; do mv "$f" "2013-10-22_$f" ; done

# Files per Extension

Recursively lists all file extensions in the current folder and below, including a count how many files there are per extension.

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