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If the program was installed with your package manager, the package manager should be able to tell you that. For example:

```
$ pacman --query bash
bash 5.2.026-2
```

------

If you don't know the package name, you need to first figure out the full path of your command, for example:
```
$ which mbsync
/usr/bin/mbsync
```

With this you can ask the package manager what package owns that file. For example:
```
$ pacman --query --owns /usr/bin/mbsync
/usr/bin/mbsync is owned by isync 1.4.4-4
```

Pacman is nice enough that it already tells me the version, but if it didn't, I would now do `pacman --query isync` to get it.