ww8central - os:linux

GNU Parallel

Anonymous (anonymous@undisclosed.example.com) — 2019-07-17T14:56:56+00:00

GNU Parallel Run commands or scripts in the shell in parallel. You can even use different PCs. This command can send data and scripts to the other PC, collect the results and clean up. Tutorials Very good video tutorial : Examples For example, create a compressed file for each subfolder of PARENT-PATH:

BASH (/bin/bash)

Anonymous (anonymous@undisclosed.example.com) — 2014-10-17T07:59:14+00:00

BASH (/bin/bash) find recursively remove all .svn dirs rm -rf `find . -type d -name .svn` find files newer/oder than find ./ -type f -type d -newermt 2007-06-07 replace a string in all files in a subdirectory find . -name '*.shtml' -type f -print0 | xargs -0 sed 's/mitarbeiter-und-studenten/staff/g' -i

Input Methods (Chinese)

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:39+00:00

Input Methods (Chinese) Enable various input Methods for example Chinese. Installation (root) apt-get install ubuntu-defaults-zh-cn ibus-pinyin ibus ibus-clutter Configuration as User im-switch -s ibus Logout and login back. ibus-setup

Oddities found in Fedora

Anonymous (anonymous@undisclosed.example.com) — 2016-10-05T19:02:30+00:00

Oddities found in Fedora 1. Not enough space in /tmp while there is space free on disk /tmp is a RAM-filesystem in Fedora configured to grand a maximum of half or RAM size. If you want to save heaps of data for some time, don't do this in /tmp, use /locData instead.

Hardware driver

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:38+00:00

Hardware driver Install client software and drivers Nvidia on Fedora Fedora only includes free gpl-compatible software. To use none-free software and drivers (Nvidia) you have to use at least the rpmFusion-Repository: su -c yum localinstall --nogpgcheck http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-18.noarch.rpm http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-18.noarch.rpm

OpenGL (libGL.so)

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:39+00:00

OpenGL (libGL.so) Different OpenGL drivers - Nvidia, Mesa, Intel - which one to choose? Usually it's enough to use: LD_LIBRARY_PATH=/path/to/libgl # Ubuntu (/usr/lib/libGL.so) There's also LIBGL_DRIVERS_PATH. And if all doesn't work, you can still use

RAM Disc

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:39+00:00

RAM Disc To create a ramdisk of size 2000MB on ww8-node1. sudo /usr/net/local/mkramdisc Create a dynamically growing ramdisc. Perhaps useful for Davids Simulation. #!/bin/sh sudo mke2fs /dev/ram0 sudo mount /dev/ram0 /media/ram0 sudo chown BENUTZERNAME /media/ram0 sudo chmod u+rwx /media/ram0

Set a VNC Password

Anonymous (anonymous@undisclosed.example.com) — 2021-01-20T15:30:39+00:00

Set a VNC Password vncpasswd Start the VNC Server vncserver Remember number at the end: New 'X' desktop is ww8-node1.ww.uni-erlangen.de:# Create a Tunnel ssh -nNT -L 5900:localhost:5900 [USERNAME]@ww8[CLIENT].ww.uni-erlangen.de Connect to the VNC Server from your Client

rsync

Anonymous (anonymous@undisclosed.example.com) — 2019-11-12T09:04:21+00:00

rsync From one Folder to another Folder (Content only) rsync -a / / One Remotefolder content into destination Folder (can be ./) rsync -a @Server://* / rsync out of Memory When syncing a lot of files, rsync build a large file-cache in memory. This can go thus far, that the system is swaping and will become unresponsable. To limit the file-caching avild the

Taking Screenshots

Anonymous (anonymous@undisclosed.example.com) — 2017-02-03T09:15:13+00:00

Taking Screenshots Using the integrated screenshot tool with the commands below the pictures will be saved in your 🗁Pictures folder. PrtSc Capture screenAlt+PrtSc Capture Active App/WindowShift+PrtSc Capture Area Other Software In old versions of Fedora (and Ubuntu) it was possible to use special applications to create and manage screenshots. With the new Wayland displaymanager an its security architecture (applications are not allowed to take screenshots of other applications windows) they…

SSH

Anonymous (anonymous@undisclosed.example.com) — 2024-07-08T16:54:54+00:00

SSH Public Access Node ssh [USERNAME]@ww8access.ww.uni-erlangen.de ssh direct to your client over 'ww8access' Add some Host and Proxy configuration to your user ssh config file of your PC at home. And you can ssh direct to your client inside the institute, which would be on normal ways unreachable.

TMUX

Anonymous (anonymous@undisclosed.example.com) — 2017-04-03T13:55:35+00:00

TMUX shortcuts & cheatsheet

TrueCrypt

Anonymous (anonymous@undisclosed.example.com) — 2015-09-11T14:32:57+00:00

TrueCrypt open encrypted files Create a new Loop-Interface. As result you will get a new Loop-Interface. $ losetup -f /dev/loop0 Then mount it with setupcrypt [TODO] here one step is missing $ cryptsetup open --type tcrypt /dev/loop0 flexdecrypted

Two Monitors

Anonymous (anonymous@undisclosed.example.com) — 2017-02-03T09:35:51+00:00

Two Monitors Two Monitors (one Beamer) with diverent resolution You can edit the xorg.conf. Or use xrandr. > xrandr --output VGA1 --auto > xrandr --output VGA2 --auto --right-of VGA1 You can replase --auto with --mode 1920x1080 for a fixed resolution.

Fix Ubunut Unity, compiz

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:39+00:00

Fix Ubunut Unity, compiz Fix errors in ubuntu, unity, compiz When the Desktop is frozen and unusable, compiz killed or shut down in some unusual way you can restart it to gain some/full functionality. Login to a text shell (tty-1 to tty-6) by pressing STRG-ALT-1 to -6.

Restore Ubuntu UEFI Boot Entries after BIOS Update

Anonymous (anonymous@undisclosed.example.com) — 2014-08-12T14:37:39+00:00

Restore Ubuntu UEFI Boot Entries after BIOS Update The Ubuntu installer will create an UEFI boot entry in BIOS during the installation of Ubuntu 12.04 LTS. When updating the BIOS these boot entries will be lost and Ubuntu will no longer boot afterwards.

Disable/Enable Autofocus

Anonymous (anonymous@undisclosed.example.com) — 2020-11-01T18:44:53+00:00

Disable/Enable Autofocus List all devices v4l2-ctl --list-devices Example: Microsoft© LifeCam Studio(TM): (usb-0000:00:14.0-2.1): /dev/video3 /dev/video4 Here /dev/video3 is the webcam. To get all options: v4l2-ctl -d /dev/video3 --list-ctrls