Steam Deck - Install Software from Command Line

gistfile1.txt

List installed software
(deck@steamdeck ~)$ flatpak list
Name                           Application ID                                Version                   Branch          Installation
Google Chrome                  com.google.Chrome                             105.0.5195.125-1          stable          system
Freedesktop Platform           org.freedesktop.Platform                      21.08.15                  21.08           system
Mesa                           org.freedesktop.Platform.GL.default           21.3.9                    21.08           system
openh264                       org.freedesktop.Platform.openh264             2.1.0                     2.0             system
Breeze GTK theme               org.gtk.Gtk3theme.Breeze                      5.25.5                    3.22            system

Check for updates
$ flatpak update

Search for software (example 'proton')
(deck@steamdeck ~)$ flatpak search proton
Name                                         Description                                                                                              Application ID                                              Version                   Branch       Remotes
Proton (community build)                     Latest Proton version built on the Flatpak Freedesktop SDK                                               com.valvesoftware.Steam.CompatibilityTool.Proton            7.0-4                     stable       flathub
Protontricks                                 A simple wrapper that does winetricks things for Proton enabled games                                    com.github.Matoking.protontricks                            1.9.2                     stable       flathub
Proton-GE (community build)                  Latest Proton-GE version built on the Flatpak Freedesktop SDK                                            com.valvesoftware.Steam.CompatibilityTool.Proton-GE         7.35-1                    stable       flathub
Proton experimental (community build)        Latest Proton experimental version built on the Flatpak Freedesktop SDK                                  com.valvesoftware.Steam.CompatibilityTool.Proton-Exp        7.0-20220919              stable       flathub
ProtonMail Import-Export app                 Import emails to your secure ProtonMail inbox or make offline backups with the Import-Export app.        ch.protonmail.protonmail-import-export-app                  1.3.3                     stable       flathub
ProtonMail Bridge                            Seamlessly encrypts and decrypts your mail as it enters and leaves your computer                         ch.protonmail.protonmail-bridge                             2.3.0                     stable       flathub
ProtonUp-Qt                                  Install Wine- and Proton-based compatibility tools                                                       net.davidotek.pupgui2                                       2.7.4                     stable       flathub
Steam                                        Launcher for the Steam software distribution service                                                     com.valvesoftware.Steam                                     1.0.0.75                  stable       flathub
Bottles                                      Run Windows software                                                                                     com.usebottles.bottles                                      2022.8.28-brescia-2       stable       flathub
Heroic Games Launcher                        An Open Source GOG and Epic Games Launcher.                                                              com.heroicgameslauncher.hgl                                 v2.4.3                    stable       flathub
ludusavi                                     Ludusavi is a tool for backing up your PC video game save data.                                          com.github.mtkennerly.ludusavi                              0.12.1                    stable       flathub
ElectronMail                                 Unofficial desktop client for ProtonMail               

Install software
$ sudo flatpak install com.github.Matoking.protontricks