The Fastmail app itself is mostly a wrapper around the web app with integrations for notifications etc. Sans notifications it works perfectly as an installed PWA on Android. Ive been using it like that for months.

Alternatively there are lots of IMAP apps available. I was testing Thunderbird for Android recently and that works pretty well too.

Disclaimer: I work for Fastmail. But any opinions I have on here are my own.

I’m an atools kinda person

You can also use systemctl status $pid to find out what service a process is from.

Pass something stupid via your bootloader so it aborts boot and dumps you in an initrd busybox shell. No usb required.

This was my poor man’s boot environments when I was using zfs on root. I had a pacman hook to snapshot before package transactions, then if it became unbootable I’d interrupt the following boot attempt, edit my grub command line with something wrong so I’d get dumped in the busybox shell, import my zfs pool and roll back before finally rebooting again.