Finding a program running as AppImage

In order to launch it from java with some command-line parameters, I'm trying to localize programmatically a certain application ran as AppImage. In my case it is the MuseScore application.

I installed it with the command ./MuseScore*.AppImage install.

I first tried from a terminal to localize that application using different options dpkg-query -L musescore and which musescore. I had no response.

In Windows, I can either search the registry or parse the result of a command-line command assoc ".myext".

Then, in Java, write use a

String program=null;
Process pr = Runtime.getRuntime().exec("cmd /c assoc \".myext\"");
try (BufferedReader reader = new BufferedReader(new InputStreamReader(pr.getInputStream()))) {
    program=reader.readLine();
}

How could I do this in Ubuntu?

./MuseScore*.AppImage install moves the appimage to ~/.local/bin.

A command named musescore is not created thus the which-command you used was useless in this case. dpkg will not give you any clue either because you didn't use dpkg to install it. The installation also created some symlinks to the appimage named mscore-portable and musescore-portable.

You can use the find-command to locate the appimage. I didn't need to do that, I simply read the output of the install-command.

To run the appimge from commandline you need to specify full path to the appimage or one of the symlinks if ~/.local/bin is not in your PATH.

If you need to know where the AppImage binary (or any file) is located, run the following command.

find / -name "*.AppImage" -exec ls -l {} \;

The command find will search root /, and then ls -l will display the path to the file(s). If the filename has changed, adjust accordingly.

As others have pointed out, using dpkg-query -L musescore does not yield any results because the binary was not installed using the package manager; thus, dpkg does not "know" its existence.

And using which musescore also does not yield results because the AppImage is not in a directory defined in the PATH, nor is the filename of the executable binary, i.e., the binary is MuseScore.AppImage and not musescore.