If you want to see what fonts have been used in creation of a PDF document, you can use pdffonts utility of poppler-utils package for this. Just type:
Some of you may have some old Truecrypt volumes lying around. Truecrypt was a nice and handy utility which is not developed anymore, unfortunately. But you still can mount the volumes created by it.
One way to do it on Ubuntu:
sudo cryptsetup tcryptOpen myvol.tc myvol
- myvol.tc – the file name of your volume
- myvol – arbitrary name of the virtual disk to be created
You will be asked for a passphrase, and if you still can remember it, the volume will be mounted under /dev/mapper with the name you provided and will show up as just another disk.
You have a table. The table has a primary key auto-increment numeric ID field. You want to fast-forward the ID to a certain value (which is larger than or equal to the last value the field has).
Example, let the ID of the next entered record be 1000:
ALTER TABLE `mytable` AUTO_INCREMENT = 1000;
You may want to check if all the information available online in regard of your domain is complete and correct.
In such a case you can go to intodns.com and enter the address of your domain to verify the settings.
One thing you will often see failing is “Reverse MX A records (PTR)” for your mail server, and this is a good way to find out if everything is all right or not.
Start and then stop VirtualBox screen recording from command line for a headless Windows 10 session running in virtual machine named Win10:
VBoxManage controlvm Win10 videocap on
VBoxManage controlvm Win10 videocap off
- This simple command will give you an SVG file with QR code vector image in it:
echo "Hello world!" | qrencode --level=H --dpi=300 --type=SVG -o qr.svg
- If a bitmap is enough, just type:
echo "Hello world!" | qrencode --level=H --dpi=300 -o qr.png
- Even this simple command will work:
qrencode -o qr.png "Hi!"
- Change the color from standard black to any if you like:
echo "Hello world!" | qrencode --foreground=808080ff --level=H --dpi=300 --type=SVG -o qr.svg
- Alpha supported too:
echo "Hello world!" | qrencode --foreground=FFFF00FF --background=0000FF55 --level=H --dpi=300 -o qr.png
echo "Hello world!" | qrencode --foreground=FFFF00FF --background=0000FF55 --level=H --dpi=300 --type=SVG -o qr.svg
By default error pages served by Apache2 contain a line at the bottom, stating version of Apache, OS etc.
If you want it gone, edit /etc/apache/apache2.conf:
- Add a line:
- Reload the new configuration:
service apache2 reload
P.S. While you are at it you may also add this to tell server not to share more information about itself than necessary: