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Please explain the loop version.

It's not really a loop, it's the second half of the REISUB magic sequence (https://en.wikipedia.org/wiki/Reisub?skin=timeless#Uses):

- switch keyboard to _r_aw mode

- gracefully t_e_rminate all processes

- k_i_ll all remaining processes

- _s_ync filesystems

- _u_nmount filesystems

- re_b_oot

You need the "loop" to feed the characters one-by-one to /proc/sysrq-trigger.

Here I thought "for" was a loop.

Thanks for the explanation what the "sub" did (and more).

So the thing to remember is that in POSIX shell (and BASH, etc.) all for loops are for-each loops. If you wanted to loop over integers, you might write `for i in $(seq 10); do echo $i; done`, but that just turns into `for i in 1 2 3 4 5 6 7 8 9 10; do echo $i; done` when it runs. So this one just iterates over "s", "u", and "b" instead.

Bruh. The mansplaining over the word "loop" is insane.

That's just a sequence of commands

echo s .. # sync echo u .. # unmount echo b .. # reboot

Just a guess though

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