ttys3

--[[

Prevent the screen from blanking while a video is playing.

This script is a workaround for the GNOME+Wayland issue documented in the
[Disabling Screensaver] section of the mpv manual, and depends on
gnome-session-inhibit (usually provided by the gnome-session package) to set up
the inhibitors.

ttys3

#!/bin/sh
# ref https://unix.stackexchange.com/a/457902

journalctl --rotate
journalctl --vacuum-time=1s

ttys3

First, install arch-install-scripts:

sudo pacman -S --needed arch-install-scripts

Secondly, mount your partitions in all the internal hard drives.

Thirdly, generate and validate your config by piping it out to stdout:

ttys3

Hyperlinks (a.k.a. HTML-like anchors) in terminal emulators

[ Update 2020-05-31: I won't be maintaining this page or responding to comments anymore. The list of supporting software reflects the known state as of this date. ]

---

Most of the terminal emulators auto-detect when a URL appears onscreen and allow to conveniently open them (e.g. via Ctrl+click or Cmd+click, or the right click menu).

It was, however, not possible until now for arbitrary text to point to URLs, just as on webpages.

ttys3

Ctrl + Alt + Space

ttys3

// Compile with e.g. `gcc -o /tmp/eatmem /tmp/eatmem.c`

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define DEFAULT_SLEEP_SECONDS 600
#define DEFAULT_ALLOC_MB 1024

ttys3

#!/bin/sh
# create a podman container with fifo named pipe as log file
# for demonstrate issue https://github.com/containers/podman/issues/13081

CTR_NAME="redis-demo"

function print_title() {
    title=$1
    echo ""
    echo "|=================== $title ===================>>>"

ttys3

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

ttys3

-- see http://lua-users.org/lists/lua-l/2021-06/msg00084.html
-- https://github.com/diegonehab/luasocket/pull/334
-- https://github.com/diegonehab/luasocket/issues/331
-- install command:
-- cd /tmp/ && curl -LO https://gist.github.com/ttys3/31dbf88ee7d708294d8ae5b0a4954424/raw/c74afc3edc1a48c0f7e1c2c9992750301bbb74ff/luasocket-scm-3.rockspec
-- luarocks install ./luasocket-scm-3.rockspec

package = "LuaSocket"
version = "scm-3"
source = {

ttys3

How do you POST a JSON file with curl??

You can post a json file with curl like so:

curl -X POST -H "Content-Type: application/json" -d @FILENAME DESTINATION

so for example: