1Password didn't support Linux last time I checked. There are 3rd party libraries, but most of them don't support the newer keychain format. I still use it and just look up the password on my phone when I'm on a Linux system.
I've tried that library, actually. Last time I used it, it couldn't find some passwords in the vault, including (crucially) the one I use for SSO at work. It's totally possible I was just using it wrong – it would be nice if the repository had a demo command line tool or something.