To reset a 3Com OfficeConnect to factory defaults:
Author: David (admin)
Hide the mouse cursor with X
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I recently got myself a touch screen, that I mounted near the entrance to welcome visitors. The device was really hard to install, as the drivers for 4 different Linux distros were broken, and only binary drivers are released. The fifth distro finally worked.
One thing that does annoy me however, is that X always shows the cursor. To hide the cursor on a touch screen, you can use the program unclutter:
yum install unclutter unclutter -idle 0 |
Unclutter with such a short delay (0 seconds) also makes it impossible to select texts, but for this application, that's just perfect.
© GeekLabInfo Hide the mouse cursor with X is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.infoBackup your phone with zero keypresses
I created some scripts to backup my Samsung Galaxy S2 to my Fedora 16 system without pressing any keys or even touching the mouse. It works like this:
To backup a SGS2, you go to settings > applications > usb tools on the phone, and click the button. You then connect it to a usb cable. At that moment, two removable devices become visible to the Linux system: one for the SD card, one for the built-in memory. But they still contain no media. Only when you press another button on the phone, the "media are inserted in the devices", triggering a "change" action with the udev daemon.
Configuration of the udev daemon
Create a file /etc/udev/rules.d/71-android-backup.rules:
SUBSYSTEM=="block", ACTION=="change", ENV{ID_SERIAL}=="Android_UMS_Composite_XXXXXXXXXXXXXXXX-0:0", ENV{DISK_MEDIA_CHANGE}=="1", ENV{ID_FS_TYPE}=="vfat", RUN+="/usr/local/bin/androidbackup" |
Whenever a (virtual) medium is inserted, a udev change action is triggered. Actually, it gets triggered multiple times, but we only need the one that has the environment variable DISK_MEDIA_CHANGE=1 set.
Action to perform
The action triggered is /usr/local/bin/androidbackup and all parameters are in the environment. So let's create that file. I use a rsnapshot-like operation to backup my data, but without actually using rsnapshot.
#!/bin/bash function msg { /usr/bin/logger -t android "$1" DISPLAY=:0 qdbus $dbusRef setLabelText "$1" DISPLAY=:0 qdbus $dbusRef Set "" value $2 } if [ "$1" != "FORKED" ]; then $0 FORKED & exit 0 fi if [ -f /etc/sysconfig/androidbackup ]; then . /etc/sysconfig/androidbackup else echo /etc/sysconfig/androidbackup does not exist exit 0 fi #debug disabled: #set > /tmp/android/`date +%s`.$RANDOM dbusRef=`kdialog --display :0 --progressbar "Backup android..." 100` msg "Attach $DEVNAME $ACTION $ID_SERIAL" 0 if [ ! -e $DESTINATION ]; then # I could mkdir -p, but sometimes $DESTINATION could just be a network location that's offline msg "Android will not be backed up: $DESTINATION is not okay" 0 exit 0 fi mkdir -p /mnt/android mount $DEVNAME /mnt/android rc=$? if [ $rc -ne 0 ]; then msg "Problem mounting $DEVNAME to /mnt/android: $rc " 0 mount | grep android 2>&1 | logger -t androidbackup exit 0 fi if [ "`mount |grep -i /mnt/android`" == "" ]; then msg "Cannot find /mnt/android in mount table" 0 exit 0 fi msg "Remove old backup" 8 [ -e $DESTINATION/backup.30 ] && rm -rf $DESTINATION/backup.30 msg "Start backup" 10 for i in `/usr/bin/seq 30 -1 2`; do if [ -e $DESTINATION/backup.$((i-1)) ]; then msg "mv $DESTINATION/backup.$((i-1)) $DESTINATION/backup.$i" 11 mv $DESTINATION/backup.$((i-1)) $DESTINATION/backup.$i fi done msg "Copy" 40 [ -e $DESTINATION/backup.0 ] && /bin/cp -al $DESTINATION/backup.0 $DESTINATION/backup.1 mkdir -p $DESTINATION/backup.0/ msg "Start rsync" 40 /usr/bin/rsync -az --numeric-ids --delete --hard-links /mnt/android/ $DESTINATION/backup.0/ touch $DESTINATION/backup.0/ chown -R $CHOWN $DESTINATION/backup.0 umount /mnt/android msg "Done" 100 exit 0 |
Since that file refers to /etc/sysconfig/androidbackup, let's also make that file:
#next line defines the location of all backups DESTINATION=/home/geeklab/.androidbackup #next line defines the owner of all files copied CHOWN=geeklab |
Use dsacls to gain access to active directory policies
I've locked myself out of group policies a couple of times. When this happens to you, you can gain access again running the following command:
dsacls.exe "CN={GUID},CN=Policies,CN=System,DC=local" /R "Authenticated users"© GeekLabInfo Use dsacls to gain access to active directory policies is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info
Konsole is driving me crazy!
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Konsole, the terminal emulator of KDE, is driving me crazy! Version 4.8 made a slight change, that breaks an essential feature I'm using.
Up to version 4.7.x, I used the command konsole --profile=Profilename to open a terminal. Then I used ctrl+alt+N to open several terminals with the same profile. For some reason, this broke in version 4.8. Since I use this feature like every minute, I'm getting very frustrated by this.
Here comes the beauty of open source: since Konsole is open source, I can fix it myself.
My changes
First, I downloaded the current version of the konsole source RPM and installed it, using rpm -i konsole-4.8.1-1.fc16.src.rpm. In ~/rpmbuild/SOURCES I created a new file named newtab.patch, containing:
--- konsole-4.8.1/src/MainWindow.cpp 2012-02-29 23:56:57.000000000 +0100 +++ konsole-4.8.1/src/MainWindow.cpp 2012-04-03 19:47:52.397594047 +0200 @@ -397,7 +397,8 @@ void MainWindow::newTab() { - Profile::Ptr defaultProfile = SessionManager::instance()->defaultProfile(); + Profile::Ptr defaultProfile = MainWindow::defaultProfile(); + //SessionManager::instance()->defaultProfile(); //Geeklab fix emit newSessionRequest(defaultProfile , activeSessionDir() , _viewManager); } |
Then I editted konsole.spec, adding a line after the one that starts with Patch50:
Patch99: newtab.patch |
After that, I added a line after the one that starts with %patch50:
%patch99 -p1 -b .newtab |
And we're done. Build the RPM using the command rpmbuild -ba konsole.spec --define "dist geeklab" and install it.
Somehow, this RPM doesn't cover all of the problems, but enough for me to be happy.
© GeekLabInfo Konsole is driving me crazy! is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.infoCheck your PC after the Nu.nl hack
Yesterday, Dutch news site nu.nl was hacked. Unfortunately, they hardly inform the public of what exactly happened. But this site has a pretty good analysis and a page to check if you are vulnerable.
You can also use MS Safety Scanner to scan your computer, which is a good idea anyway.
I'm happy to say that my clients are all up-to-date and thus not infected.
How to generate SSH Fingerprint DNS records
ssh-keygen -f /etc/ssh/ssh_host_rsa_key.pub -r hostname ssh-keygen -f /etc/ssh/ssh_host_dsa_key.pub -r hostname |
You can put the output to your dns zone.
© GeekLabInfo How to generate SSH Fingerprint DNS records is a post from GeekLab.info. You are free to copy materials from GeekLab.info, but you are required to link back to http://www.geeklab.info