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Techdirt · all Platonic solids are Rupert!

sudo apt-get install build-essential

sudo apt install -y libqpdf-dev libpaper-dev

/opt/homebrew/Cellar/qpdf/12.0.0/include/qpdf/InputSource.hh:85:19: error: function definition does not declare parameters
   85 |     qpdf_offset_t last_offset{0};
      |                   ^

c++ -o paperjam paperjam.o pdf-tools.o parse.o cmds.o pdf.o -lqpdf -lpaper
ld: library 'qpdf' not found

paperjam: $(OBJS)
	$(LD) -o $@ $^ $(LDLIBS)

CPPFLAGS="-I/opt/homebrew/include" LDLIBS="-L/opt/homebrew/lib -liconv" make paperjam

make qf

make blah

  env.NIX_LDFLAGS = lib.optionalString stdenv.hostPlatform.isDarwin "-liconv";

cp qf ~/bin

POST /oauth2/token HTTP/1.1
Host: acme.okta.com
Content-Type: application/x-www-form-urlencoded

grant_type=urn:ietf:params:oauth:grant-type:token-exchange
&requested_token_type=urn:ietf:params:oauth:token-type:id-jag
&audience=https://auth.slack.com/
&subject_token=eyJraWQiOiJzMTZ0cVNtODhwREo4VGZCXzdrSEtQ...
&subject_token_type=urn:ietf:params:oauth:token-type:id_token
&client_assertion_type=urn:ietf:params:oauth:client-assertion-type:jwt-bearer
&client_assertion=eyJhbGciOiJSUzI1NiIsImtpZCI6IjIyIn0...

HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-store

{
  "issued_token_type": "urn:ietf:params:oauth:token-type:id-jag",
  "access_token": "eyJhbGciOiJIUzI1NiIsI...",
  "token_type": "N_A",
  "expires_in": 300
}

POST /oauth2/token HTTP/1.1
Host: auth.slack.com
Authorization: Basic yZS1yYW5kb20tc2VjcmV0v3JOkF0XG5Qx2

grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer
assertion=eyJhbGciOiJIUzI1NiIsI...

HTTP/1.1 200 OK
Content-Type: application/json
Cache-Control: no-store

{
  "token_type": "Bearer",
  "access_token": "2YotnFZFEjr1zCsicMWpAA",
  "expires_in": 86400
}

for term in $(toe -a | awk '{print $1}')
do
  echo $term
  infocmp -1 -T "$term" 2>/dev/null | grep 'clear=' | sed 's/clear=//g;s/,//g'
done

ps -p $$ -o pid,comm=

$ npm install -g http-server
$ http-server
bash: http-server: command not found

$ ~/.npm-global/bin/http-server
Starting up http-server, serving ./public

export PATH=$PATH:~/.npm-global/bin/

path=(
  $path
  ~/.npm-global/bin
)

set PATH $PATH ~/.npm-global/bin

$ which -a python3
/usr/bin/python3
/opt/homebrew/bin/python3

export PATH=/opt/homebrew/bin/:$PATH

set PATH ~/.cargo/bin $PATH

This is usually done by running one of the following (note the leading DOT):

. "$HOME/.cargo/env"        	# For sh/bash/zsh/ash/dash/pdksh
source "$HOME/.cargo/env.fish"  # For fish

fish_add_path /some/directory

unbuffer rg blah |  less -R

pbpaste | black - | pbcopy

tail -f /some/log/file | grep thing1 | grep thing2

tail -f /some/log/file | grep thing1 | grep thing2

sudo tcpdump -ni any port 53 | grep example.com

sudo tcpdump -ni any port 53 > output.txt

tail -f /some/log/file | grep thing1 | grep thing2

cat /some/log/file | grep thing1 | grep thing2 | tail

tail -f /some/log/file | grep --line-buffered thing1 | grep thing2

tail -f /some/log/file |  awk '/thing1/ && /thing2/'

tail -f /some/log/file |  grep -E 'thing1.*thing2'

tail -f /some/log/file | stdbuf -o0 grep thing1 | grep thing2

tail -f /some/log/file | unbuffer grep thing1 | grep thing2

$ cd /tmp/whatever
$ npm install chart.js
$ cd node_modules/chart.js/dist
$ ls *.*js
chart.cjs  chart.js  chart.umd.js  helpers.cjs  helpers.js

<script src="./chart.umd.js"> </script>

  "jsdelivr": "./dist/chart.umd.js",
  "unpkg": "./dist/chart.umd.js",
  "main": "./dist/chart.cjs",
  "module": "./dist/chart.js",

$ npm install @atcute/oauth-browser-client
$ cd node_modules/@atcute/oauth-browser-client/dist
$ ls *js
constants.js  dpop.js  environment.js  errors.js  index.js  resolvers.js

export { configureOAuth } from './environment.js';
export * from './errors.js';
export * from './resolvers.js';

<script type="importmap">
{
  "imports": {
    "nanoid": "./node_modules/nanoid/bin/dist/index.js",
    "nanoid/non-secure": "./node_modules/nanoid/non-secure/index.js",
    "nanoid/url-alphabet": "./node_modules/nanoid/url-alphabet/dist/index.js",
    "@atcute/oauth-browser-client": "./node_modules/@atcute/oauth-browser-client/dist/index.js",
    "@atcute/client": "./node_modules/@atcute/client/dist/index.js",
    "@atcute/client/utils/did": "./node_modules/@atcute/client/dist/utils/did.js"
  }
}
</script>

$ npm install @atproto/oauth-client-browser
$ cd node_modules/@atproto/oauth-client-browser/dist
$ ls *js
browser-oauth-client.js  browser-oauth-database.js  browser-runtime-implementation.js  errors.js  index.js  indexed-db-store.js  util.js

__exportStar(require("@atproto/oauth-client"), exports);
__exportStar(require("./browser-oauth-client.js"), exports);
__exportStar(require("./errors.js"), exports);
var util_js_1 = require("./util.js");

<script type="module" src="script.js"> </script>

import { BrowserOAuthClient } from "https://esm.sh/@atproto/oauth-client-browser@0.3.0"

$ stty -a
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
	eol2 = <undef>; erase = ^?; intr = ^C; kill = ^U; lnext = ^V;
	min = 1; quit = ^\; reprint = ^R; start = ^Q; status = ^T;
	stop = ^S; susp = ^Z; time = 0; werase = ^W;

$ strace -tt -o out  vim
$ grep ioctl out | grep SET

17:43:36.670636 ioctl(0, TCSETS, {c_iflag=IXANY|IMAXBEL|IUTF8,
c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST, c_cflag=B38400|CS8|CREAD,
c_lflag=ECHOK|ECHOCTL|ECHOKE|PENDIN, ...}) = 0

17:43:38.027284 ioctl(0, TCSETS, {c_iflag=ICRNL|IXANY|IMAXBEL|IUTF8,
c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD,
c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE|PENDIN, ...}) = 0

$ du -sh *.tsv
26M	ip2asn-v4.tsv
11M	ip2asn-v6.tsv

type IPRange struct {
	StartIP net.IP
	EndIP   net.IP
	Num     int
	Name    string
	Country string
}

CREATE TABLE ipv4_ranges (
   start_ip INTEGER NOT NULL,
   end_ip INTEGER NOT NULL,
   asn INTEGER NOT NULL,
   country TEXT NOT NULL,
   name TEXT NOT NULL
);
CREATE TABLE ipv6_ranges (
   start_ip TEXT NOT NULL,
   end_ip TEXT NOT NULL,
   asn INTEGER,
   country TEXT,
   name TEXT
);
CREATE INDEX idx_ipv4_ranges_start_ip ON ipv4_ranges (start_ip);
CREATE INDEX idx_ipv6_ranges_start_ip ON ipv6_ranges (start_ip);
CREATE INDEX idx_ipv4_ranges_end_ip ON ipv4_ranges (end_ip);
CREATE INDEX idx_ipv6_ranges_end_ip ON ipv6_ranges (end_ip);

	ips := []net.IP{}
	count := 20000
	for i := 0; i < count; i++ {
		// create a random IPv6 address
		bytes := randomBytes()
		ip := net.IP(bytes[:])
		ips = append(ips, ip)
	}
	now := time.Now()
	success := 0
	for _, ip := range ips {
		_, err := ranges.FindASN(ip)
		if err == nil {
			success++
		}
	}
	fmt.Println(success)
	elapsed := time.Since(now)
	fmt.Println("number per second", float64(count)/elapsed.Seconds())

sqlite> explain query plan select * from ipv6_ranges where '2607:f8b0:4006:0824:0000:0000:0000:200e' BETWEEN start_ip and end_ip;
QUERY PLAN
`--SEARCH ipv6_ranges USING INDEX idx_ipv6_ranges_end_ip (end_ip>?)

func memusage() {
	runtime.GC()
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	fmt.Printf("Alloc = %v MiB\n", m.Alloc/1024/1024)
	// write mem.prof
	f, err := os.Create("mem.prof")
	if err != nil {
		log.Fatal(err)
	}
	pprof.WriteHeapProfile(f)
	f.Close()
}

type IPRange struct {
	StartIP net.IP
	EndIP   net.IP
	Num     int
	Name    string
	Country string
}

type IPRange struct {
	StartIP netip.Addr
	EndIP   netip.Addr
	ASN     uint32
	Idx     uint32
}

type ASNInfo struct {
	Country string
	Name    string
}

type ASNPool struct {
	asns   []ASNInfo
	lookup map[ASNInfo]uint32
}

59.101.179.0	59.101.179.255	4294901931	Unknown	AS4294901931

<small>
[a link](https://example.com)
</small>

<small>

[a link](https://example.com)

</small>

<small> [a link](https://example.com) </small>

markup:
  goldmark:
    extensions:
      typographer:
        leftAngleQuote: '&lt;&lt;'
        rightAngleQuote: '&gt;&gt;'

1. a
  * b
  * c
2. b

* something
> quote
* something else

* # passengers: 20

`1 / (1
+ exp(-1)) = 0.73`

<p><code>1 / (1
+ exp(-1)) = 0.73</code></p>

<p>`1 / (1</p>
<ul>
<li>exp(-1)) = 0.73`</li>
</ul>

I set up a small Hadoop cluster (1 master, 2 workers, replication set to 
1) on 

"Oh, *interesting*!"

<img src="https://jvns.ca/images/rustboot1.png">

<br><br>

markup:
  highlight:
    codeFences: false
  goldmark:
    renderer:
      unsafe: true
    parser:
      autoHeadingIDType: blackfriday

def color(num, text):
    return f"\033[38;5;{num}m{text}\033[0m"

for i in range(16):
    print(color(i, f"number {i:02}"))

$ unbuffer fd . > out
$ vim out
^[[38;5;48mbad-again.sh^[[0m
^[[38;5;48mbad.sh^[[0m
^[[38;5;48mbetter.sh^[[0m
out

	// DELETE /records:
	case r.Method == "DELETE" && n == 1 && p[0] == "records":
		if !requireLogin(username, r.URL.Path, r, w) {
			return
		}
		deleteAllRecords(ctx, username, rs, w, r)
	// POST /records/<ID>
	case r.Method == "POST" && n == 2 && p[0] == "records" && len(p[1]) > 0:
		if !requireLogin(username, r.URL.Path, r, w) {
			return
		}
		updateRecord(ctx, username, p[1], rs, w, r)

	mux.HandleFunc("DELETE /records/", app.deleteAllRecords)
	mux.HandleFunc("POST /records/{record_id}", app.updateRecord)

	mux.Handle("DELETE /records/", requireLogin(http.HandlerFunc(app.deleteAllRecords)))

-- name: GetVariant :one
SELECT *
FROM variants
WHERE id = ?;

const getVariant = `-- name: GetVariant :one
SELECT id, created_at, updated_at, disabled, product_name, variant_name
FROM variants
WHERE id = ?
`

func (q *Queries) GetVariant(ctx context.Context, id int64) (Variant, error) {
	row := q.db.QueryRowContext(ctx, getVariant, id)
	var i Variant
	err := row.Scan(
		&i.ID,
		&i.CreatedAt,
		&i.UpdatedAt,
		&i.Disabled,
		&i.ProductName,
		&i.VariantName,
	)
	return i, err
}

export GOMEMLIMIT=250MiB

$ ls blah.txt

[bork@grapefruit linux-playground (main)]$ echo hi
hi
[bork@grapefruit linux-playground (main)]$ touch blah
[bork@grapefruit linux-playground (main)]$ echo hi
hi

bork@grapefruit ~/work/> echo hi

                         touch blah
                         echo hi

bork@grapefruit ~/work/> ls 
api/  blah.py     fly.toml   README.md
blah  Dockerfile  frontend/  test_websocket.sh

$ config.fish

$ vim ~/.config/fish/config.fish

for i in *.yaml
  echo $i
end

$ bash
$ for i in *.png
> do
> echo $i
> done
$ # press up arrow
$ for i in *.png; do echo $i; done ink

fish_add_path /some/directory

set PATH $PATH /some/directory/bin

{
  values: {'Preference': 10, 'Server': 'mail.example.com'},
  content: '10 mail.example.com',
  ...
}

type Thing struct {
    Name string
}

thing := Thing{"record"}
other_thing := thing
other_thing.Name = "banana"
fmt.Println(thing)

type Thing struct {
  Name string
}
func findThing(things []Thing, name string) *Thing {
  for _, thing := range things {
    if thing.Name == name {
      return &thing
    }
  }
  return nil
}

func main() {
  things := []Thing{Thing{"record"}, Thing{"banana"}}
  thing := findThing(things, "record")
  thing.Name = "gramaphone"
  fmt.Println(things)
}

func findThing(things []Thing, name string) *Thing {
  for i := range things {
    if things[i].Name == name {
      return &things[i]
    }
  }
  return nil
}

x := []int{1, 2, 3, 4, 5}
y := x[2:3]
y = append(y, 555)
fmt.Println(x)

$ ls l-^[[D^[[D^[[D

(reverse-i-search)`':

$ python3
>>> importt subprocess;5D

$ python3 -c "import readline; print(readline.__doc__)"
Importing this module enables command line editing using libedit readline.

$ jobs
Job Group State   Command
1   3161  running cat < /dev/zero &
2   3264  stopped nvim -w ~/.vimkeys $argv

$ echo kill %2
kill %2
$ type kill
kill is a function with definition
# Defined in /nix/store/vicfrai6lhnl8xw6azq5dzaizx56gw4m-fish-3.7.0/share/fish/config.fish

# start tcpdump
$ sudo tcpdump -ni any port 1234 &
tcpdump: data link type PKTAP
tcpdump: verbose output suppressed, use -v[v]... for full protocol decode
listening on any, link-type PKTAP (Apple DLT_PKTAP), snapshot length 524288 bytes

# run curl
$ curl google.com:1234
13:13:29.881018 IP 192.168.1.173.49626 > 142.251.41.78.1234: Flags [S], seq 613574185, win 65535, options [mss 1460,nop,wscale 6,nop,nop,TS val 2730440518 ecr 0,sackOK,eol], length 0
13:13:30.881963 IP 192.168.1.173.49626 > 142.251.41.78.1234: Flags [S], seq 613574185, win 65535, options [mss 1460,nop,wscale 6,nop,nop,TS val 2730441519 ecr 0,sackOK,eol], length 0
13:13:31.882587 IP 192.168.1.173.49626 > 142.251.41.78.1234: Flags [S], seq 613574185, win 65535, options [mss 1460,nop,wscale 6,nop,nop,TS val 2730442520 ecr 0,sackOK,eol], length 0

# when you're done, kill the tcpdump in the background
$ kill %1 

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step 3: run `./configure` (if needed)

step 4: run `make`

`make` uses environment variables to configure the compiler and linker

secret environment variable: `CPPFLAGS`

two ways to pass environment variables to `make`

how to use `CPPFLAGS` and `LDLIBS` to fix this compiler error

tip: how to just build 1 specific file: `make $FILENAME`