Find disk usage at command line

To find out disk usage by directories, use:

  • ncdu

Web fonts do not show if www missing

You may experience a situation when the locally served Web fonts used in your website do not show if the address is entered in the browser without the leading “www” part, for example, instead of “” you type it in simply as “”.

The simplest solution is to just redirect all requests that are missing the “www” part to the correct address with an .htaccess file like this:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^example\.com$ [NC]
RewriteRule ^{REQUEST_URI} [R=301,L]

Generate strong password with apg

The passwords created at default settings by the apg utility are probably quite all right for everyday purposes, but sometimes you want a stronger security, so you may run it with few extra parameters to generate stronger passwords:

  • apg -m 20 -x 1 -M SNCL -a 1

Generating nice and ordered random names

You may want to generate random names, ordered by alphabet, which sound nice, instead of using total random gibberish or, on the opposite, using standard “alpha”,”bravo” etc. naming convention.

This may be useful for naming product versions or any other purpose where you need a sequential indexing of items.

One solution is to use, enter the first letter in accordance to your current version, and pick one name to your liking from the generated results.

Photoshop PSD thumbnailer for Gnome file manager

This script generates a system script and associated meta-information for displaying Adobe Photoshop .PSD image thumbnails in Gnome file manager. It is intended to work with Nautilus, but also works with Nemo in Linux Mint 18.2 Sonya Cinnamon, even though “Add GConf Hooks” section of the script fails.

Run the script with sudo and reboot afterwards.

The script was acquired from here, and it is actually preferable that you get it from there, because here it may be automatically reformatted and fail at execution. It is posted here only for archival purposes.


# ———————————————————–
# — Write psdthumbnailer
# ———————————————————–
sudo cat <<‘EOF’ # bin/bash # Arguments / Parameters %i %o %s f_in=$1 f_out=$2 f_size=$3 # Execute Convert PSD to PNG through ImageMagick exec convert “psd:$f_in[0]” -scale “$f_sizex$f_size” “png:$f_out” EOF ) > $OUTFILE
# ———————————————————–
# — Write photoshop.thumbnailer
# ———————————————————–
sudo cat <<‘EOF’ # bin/bash [Thumbnailer Entry] TryExec=/usr/lib/psdthumbnailer Exec=/usr/lib/psdthumbnailer %i %o %s MimeType=image/vnd.adobe.photoshop; image/x-photoshop; image/x-psd; EOF ) > $OUTFILE
# ———————————————————–
# — Set File Permissions
# ———————————————————–
sudo chmod 0755 /usr/lib/psdthumbnailer
sudo chmod 0644 /usr/share/thumbnailers/photoshop.thumbnailer

# ———————————————————–
# — Add GConf Hooks to parse thumbnails
# ———————————————————–
sudo gconftool-2 –set /desktop/gnome/thumbnailers/image@vnd.adobe.photoshop/enable –type bool true

sudo gconftool-2 –set /desktop/gnome/thumbnailers/image@vnd.adobe.photoshop/command –type string “/usr/lib/psdthumbnailer %i %o %s %i %o %s”

# ———————————————————–
# — Install Dependencies
# ———————————————————–

sudo apt-get install imagemagick

Run a process in VirtualBox from outside

You can launch a program within an Oracle VirtualBox virtual machine from the host system’s command prompt.

Example 1:  Run notepad in MS Windows 7 virtual machine named “7” as user “user” with password “1” from Ubuntu:

  • VBoxManage guestcontrol "7" run --exe "C:\\Windows\\notepad.exe" --username user --password 1

Example 2: Output guest network info:

  • VBoxManage --nologo guestcontrol "7" run --exe "c:\\windows\\system32\\ipconfig.exe" --username user --password 1 --wait-stdout


  • You must have Guest Additions installed
  • The user account must have a password

Missing php-mbstring

After (re-)installing PHP and attempting to run a script, you may see an error message saying “PHP Fatal error: Uncaught Error: Call to undefined function mb_strtoupper()”.

Well, you may be missing the php-mbstring extension to PHP. Simply install it by:

  • sudo apt-get install php-mbstring