> sudo echo $NUM_PAGES > /proc/sys/vm/nr_hugepages This won't work :) echo will ...

thayne · 2026-02-05T05:49:11 1770270551

Or

    echo $NUM_PAGES | sudo tee /proc/sys/vm/nr_hugepages

I've always found it odd that there isn't a standard command to write stdin to a file that doesn't also write it to stdout. Or that tee doesn't have an option to supress writing to stdout.

axiolite · 2026-02-05T06:00:00 1770271200

You forgot the "sudo" before "tee"

> write stdin to a file that doesn't also write it to stdout

You mean like "dd of=/path/file" ?

zdragnar · 2026-02-05T16:13:36 1770308016

I physically/literally squinted when I saw disk destroyer.

I know it's useful for other things, but it has become a fearful instinct at this point.

goestin · 2026-02-06T20:17:32 1770409052

If my memories serves me right it was meant to be "Copy Convert" but "cc" was already taken for "C Compiler" so they went to the next letter in the alphabet (alpha beta), hence "dd". Thanks for listening to my TED talk of useless and probably false information :)

edit: i will be stealing disk destroyer, though

axiolite · 2026-02-07T05:59:59 1770443999

    According to Dennis Ritchie, the name is an allusion to the DD statement found in IBM's Job Control Language (JCL), where DD is short for data definition  https://en.wikipedia.org/wiki/Dd_%28Unix%29#History

vbezhenar · 2026-02-05T15:20:02 1770304802

I've always thought that there should be `cat -o output-file` flag for that. GNU coreutils have miriads of useless flags and missing one actually useful flag LoL.

And probably `echo -o output-file` as well.

TheDong · 2026-02-05T09:53:40 1770285220

> I've always found it odd that there isn't a standard command to write stdin to a file that doesn't also write it to stdout

If you happen to have moreutils installed, you can do that with pee

    echo $NUM_PAGES | sudo pee 'cat > /proc/sys/vm/nr_hugepages'

direwolf20 · 2026-02-05T11:37:18 1770291438

why not write sh -c then?

TheDong · 2026-02-05T12:33:58 1770294838

Because 'sh' isn't in moreutils and is harder to remember, next question.

Why use something portable when you can use cat pee?

semiquaver · 2026-02-05T16:45:11 1770309911

Personally? Because I hate the smell.

wang_li · 2026-02-05T19:08:10 1770318490

It’s not an option or feature because it’s built into the shell. Just slap a > /dev/null on the end.

thayne · 2026-02-05T20:21:55 1770322915

That works, but it feels wasteful to needlessly copy it, and it is verbose.

timetoogo · 2026-02-05T06:16:21 1770272181

Great point, I was running as root so I didn't pick this up. Corrected, thank you!