How can I disable the shutter sound of gnome-screenshot?

I found the solution here. The sound played is /usr/share/sounds/freedesktop/stereo/camera-shutter.oga. So simply renaming that file stops it from being played:

sudo mv /usr/share/sounds/freedesktop/stereo/camera-shutter.oga \
    /usr/share/sounds/freedesktop/stereo/damn-camera-shutter.oga

That's it, next time you take a screenshot, it will be done in silence.

The other solution¹ has some inconveniences:
- it requires root access
- it's a global change so it affects all users
- upgrading sound-theme-freedesktop restores the file

For the record, the proper way to do it (and avoid all of the above) is via a custom sound theme that disables² the default sound file used by gnome-screenshot (the name of the file is screen-capture.oga corresponding to the screen-capture event - hardcoded in gnome-settings-daemon and gnome-screenshot).
Create the custom theme directory:

mkdir -p ~/.local/share/sounds/__custom

create the .disabled file:

touch ~/.local/share/sounds/__custom/screen-capture.disabled

add the index.theme:

cat << 'EOF' > ~/.local/share/sounds/__custom/index.theme
[Sound Theme]
Name=__custom
Inherits=freedesktop
Directories=.
EOF

set __custom as default theme name:

gsettings set org.gnome.desktop.sound theme-name '__custom'

Or, if you're using Cinnamon:

gsettings set org.cinnamon.desktop.sound theme-name '__custom'

and enjoy the silence...

---

^{1: Yeah, I know it's actually my solution but at the time of posting it on the arch forums I was just being lazy...}

^{2: A pseudo file format ".disabled" is used for disabling sounds in a theme that inherits from another theme. If the sound lookup algorithms detects a file with the suffix ".disabled" it shall immediately terminate the lookup logic and consider the sound not available. All files with ".disabled" suffix should be of length zero.}

Renaming the shutter sound file is OK, but probably won't work if you don't have root access to the system. Here's an alternative approach:

#!/bin/bash
volume=$(amixer sget Master | awk -F '[],[,%]'  '/%/{print $2 }')
amixer sset Master 0
gnome-screenshot
amixer sset Master "$volume"%

What this script does is remember volume percentage, set volume temporarily to 0, take screenshot, and once gnome-screenshot process exits, the volume is restored back to original percentage.

The advantage of this approach is that it is flexible and can be customized to suit your needs. This script can be bound to PrntScr button, or to custom shortcut.

Tested on Ubuntu 16.04 LTS