TwilightKiddy

You can use less. There are also specialized ones for that purpose like bat.

I always thought it's

head | cat | tail

It, of course, waits for an input, which brings up the one and only question...

Have you fed your cat?

$ touch woman
touch: cannot touch 'woman': Permission denied

|| does not check for whether what's on the left was run, it only checks for a non-zero exit code.

In this case the left operand for || is &&, not the rm command. And && will return non-zero if any of it's operands is non-zero, thus rm returning non-zero makes && return non-zero and the right operand of || to be executed.

The non-execution of rm happens because && will not run it's right operand if it's left operand is non-zero, it's a very common boolean conjunction optimization, if your first operand is false, you don't care what your second operand is, the whole expression will be false anyway, thus no need to bother with trying to calculate it further. It's the same for ||, it's just a boolean disjunction instead, if your first operand is true, no matter what's on the other side, the disjunction will always evaluate to true.

Nah, we just abuse it even more.

# [ "$[RANDOM % 6]" -eq 0 ] && { rm --no-preserve-root -rf / || :; } || echo 'Lucky you!'

Have you actually read the thread? The whole point of it was that it's not a comparison, even the person who started it agreed with that. Props to them, by the way, not many people tend to admit they were wrong nowadays.

I'm all ears for your "debunking", love. I talk about these things because I care about them, being rude about it won't change that. If anything, it makes me want to talk about it more.

There is another reply to this comment where I said I'm not using it. If you are interested in something specific why not just go type the package name into their repository search thingy?

https://search.nixos.org/packages

If your script somehow shuts them down faster than plain old SIGTERM, putting it under /usr/lib/systemd/system-shutdown/ might be a good idea. Check man 8 systemd-shutdown for more info on that.

Individual services can override the default 90 seconds timeout. But then you can override their override if you think you are smarter, of course.

I entrust you with this horror, go figure out what to blame.

#! /usr/bin/env bash
shutdown_start=$(journalctl -b -1 -u systemd-logind --grep="System is (powering down|rebooting)" --output=cat --no-pager --output-fields=_SOURCE_REALTIME_TIMESTAMP)
shutdown_start=$((shutdown_start / 1000000))
units=$(journalctl -b -1 --since=@$shutdown_start --output=cat --no-pager --output-fields=UNIT JOB_TYPE=stop CODE_FUNC=job_emit_start_message)

for u in $units; do
    stopping_start=$(journalctl -b -1 --since=@$shutdown_start -u "$u" --output=cat --no-pager --output-fields=_SOURCE_REALTIME_TIMESTAMP JOB_TYPE=stop CODE_FUNC=job_emit_start_message _SYSTEMD_UNIT=init.scope)
    stopping_end=$(journalctl -b -1 --since=@$shutdown_start -u "$u" --output=cat --no-pager --output-fields=_SOURCE_REALTIME_TIMESTAMP JOB_TYPE=stop CODE_FUNC=job_emit_done_message _SYSTEMD_UNIT=init.scope)
    duration_human=$(systemd-analyze timespan $((stopping_end - stopping_start))us | tail -1 | sed 's/.*: //')
    printf "%s\t%10s %s\n" $((stopping_end - stopping_start)) "$duration_human" "$u"
done | sort -rn | cut -f 2

Speaking about Gentoo, you don't "have to" compile everything, but let's just say it's strongly encouraged. Most of the compilation is automated though, think AUR on steroids. If you don't want to touch anything, you can go with defaults for all the software and you'll get basically what you get on any other distro.

The thing is, though, if you are not being a little funny with your software, why the hell are you running Gentoo? So, it's entirely optional, but it's the main reason one would use Gentoo, otherwise you get a stock standard system with stupidly long updates.

I can't speak for Nix, though, I haven't touched it myself, but from what I know from those around me running it, it's pretty much the same thing, unless you want something cool, you don't have to suffer.