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kayson • today at 5:41 AM • 2 replies • view on HN

> 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.

Replies

thayne • today at 5:49 AM

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.
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timetoogo • today at 6:16 AM

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