You might want rotate an image from the command line using the command line in Ubuntu. This is really usefull if you are stripting pdf manipulations.
sudo apt-get install pdftk
Then
pdftk input.pdf cat 1east output output.pdf
Happy rotating.
Author: james
How to test if Bacula-fd is running
I just installed a new Bacula client but for some reason the server could not connect to it. I found this out by trying to get the status of the client on the server with the following command:
sudo bconsole status client=my.client-rd
Here is the things that I checked on the server.
Step 1 – Check that the service bacula-fd is started:
sudo service bacula-fd status
Step 2 – Check the bacula-fd process is bound to the port 9102
sudo netstat -an|grep 9102
Step 3 – Check that you can telnet into the client port from the server.
telnet ip.ad.dr.ess 9102
I found the the client configuration did have the correct client ipaddress but each of these checks enabled me to narrow down the problem.
The Teamviewer daemon is not running – please start the daemon ubuntu
I have just started using Teamviewer on Ubuntu 13.10 to help a few people setup some software on their computers. When I try and launch it pops up a dialogue saying:
The TeamViewer daemon is not running!
Please start the daemon (needs root permissions) before running TeamViewer
teamviewer –daemon start
….
Trying “sudo teamviewer –daemon start” doesn’t actually do anything – so the solution is to:
sudo teamviewer --daemon enable
php ini_set(“memory_limit”) isn’t working at all
If you are trying to set your php memory limit at the top of a php script using the php int_set() and it doesn’t appear to have any affect then there is a chance that you have the PHP Suhosin security extension installed. Suhosin stops a script from being able to increase the memory limit.
If you have the Suhosin extension installed then simply edit /etc/php5/conf.d/suhosin.ini and change:
;suhosin.memory_limit = 0
To:
suhosin.memory_limit = 1G
Or however much memory you would like to allow for the script. Then restart nginx / or apache.
sudo service apache2 restart
Note – if you use int_set() and attempt to set a higher memory limit than allowed in the suhosin settings then it will no have any affect at all.
How to make Teamviewer work on Ubuntu 13.10 – install lib32asound2?
I had a problem installing Teamviewer on Ubuntu 13.10. This is an awesome tool for helping to remote desktop into other Linux or Windows machines. I downloaded the .deb file but when installing it complained:
unresolvable dependency: lib32asound2
I did some research and some various solutions including installing the package which has been removed from Ubuntu:
The lib32asound2 package is deleted from saucy: https://launchpad.net/ubuntu/saucy/amd64/lib32asound2
You can download lib32asound2 from: https://launchpad.net/ubuntu/saucy/amd64/lib32asound2/1.0.25-4ubuntu4
Direct link for a .deb download for lib32asound2: http://launchpadlibrarian.net/139194357/lib32asound2_1.0.25-4ubuntu4_amd64.deb
So, I downloaded the .deb for this package but got even more dependency errors including:
dpkg: error processing lib32asound2_1.0.25-4ubuntu4_amd64.deb (–install):
cannot access archive: No such file or directory
Errors were encountered while processing:
lib32asound2_1.0.25-4ubuntu4_amd64.deb
The Solution:
The solution for me was to install a different Teamviewer installer:
http://download.teamviewer.com/download/teamviewer_linux.deb
God knows why this teamviewer.deb worked for me but it did.
How to reset your Apple password
I forgot the password to my Macbook Pro and it turns out that there aren’t very many short guides on this. However, it turns out that it is very easy to reset the password on a Macbook.
Step 1 – Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Step 2 – When the menu bar appears select Terminal from the Utilities menu. Enter reset password at the prompt and press RETURN. Follow instructions in the dialog window that will appear.
How to repair / restore Grub on Ubuntu using Live CD
I just upgraded Ubuntu and selected the wrong location to install Grub onto. Basically, I installed Grub on /dev/sda1 and not /dev/sda and so I need to repair and installing grub.
I got out an Ubuntu installer cd which is essential a live cd and booted in it up. Then mounted the sda1 partition:
sudo mount /dev/sda1 /mnt
Grub then needs to have access to /dev so:
sudo mount --bind /dev /mnt/dev
To install Grub on sda then:
grub-install /dev/sda --root-directory=/mnt/ /dev/sda
Note: we are using the –root-directory option rather than changing the root directory using the chroot command which sometimes doesn’t work on a live CD.
For a tutorial with more words these two pages might helped you learn more:
Where you should install grub? sda or sda1
If you are install Grub – you will might be given the choice of:
/dev/sda /dev/sda1
The answer is to install it on /dev/sda
Note – If you install grub on a partition (such as sda1) it will only work if you are are chain-loading your bootloader.
How to generate a random mac address on Ubuntu command line
If you are creating a KVM host you can sometimes get the error such XML error: expected unicast mac address. Basically, you if you have manually entered a mac address which meets the Unicast standard then it will cause problems.
Here is a quick way of generating a proper MAC Address:
openssl rand 6 | xxd -p | sed 's/\(..\)/\1:/g; s/:$//'
Visualising your source code with gource…
This is the settings that worked for me when running gource
xvfb-run -a -s “-screen 0 1280x720x24” gource -s 0.4 -p 0.01 -1280×720 –auto-skip-seconds .4 –multi-sampling –stop-at-end –highlight-users –hide mouse,progress,filenames,dirnames –file-idle-time 0 –background-colour 111111 –font-size 20 –title “Omlet Lib 4_1” –output-ppm-stream – –output-framerate 60 | avconv -y -r 60 -f image2pipe -vcodec ppm -i – -b 8192K movie.mp4