zlacker

> sudo echo $NUM_PAGES > /proc/sys/vm/nr_hugepages

This won't work :) echo will run as root but the redirection is still running as the unprivileged user. Needs to be run from a privileged shell or by doing something like sudo sh -c "echo $NUM_PAGES > /proc/sys/vm/nr_hugepages"

The point gets across, though, technicality notwithstanding.

>>kayson+(OP)
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.

>>thayne+E
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" ?

>>kayson+(OP)
Great point, I was running as root so I didn't pick this up. Corrected, thank you!

>>thayne+E
> 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'

>>TheDon+7s
why not write sh -c then?

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

Why use something portable when you can use cat pee?

>>thayne+E
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.

>>axioli+K1
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.

>>TheDon+UJ
Personally? Because I hate the smell.

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

>>wang_l+jX1
That works, but it feels wasteful to needlessly copy it, and it is verbose.