greymd

; ひねくれた方法な気がする。

(map
    3#(match [%1 %2 %3] something {
      [[_ ,0 ,0] FizzBuzz]
      [[_ ,0 _] Fizz]
      [[_ _ ,0] Buzz]
      [[$i _ _] i]})
        (map 1#[%1 (modulo %1 3) (modulo %1 5)] (take 100 nats)))

greymd

# Input is like {"command":"bHMgLWFsIHwgZ3JlcCBob2dlaG9nZQo="}
function handler () {
    EVENT_DATA="$1"
    local _cmd
    local _tmpdir
    _cmd="$(tr -d '[:space:]' <<<"$EVENT_DATA" | sed -E "s/\{[\"']command[\"']:[\"']([0-9A-Za-z+/=]*)[\"']\}/\1/" | base64 --decode)"
    _tmpdir="$(mktemp)"
    eval "$_cmd" 2> "$_tmpdir-stderr" > "$_tmpdir-stdout" || true
    echo "{\"stdout\": \"$(cat "$_tmpdir-stdout" | base64 | tr -d '\n')\", \"stderr\": \"$(cat "$_tmpdir-stderr" | base64 | tr -d '\n')\"}" || true
    rm -rf "$_tmpdir-stderr" "$_tmpdir-stdout" "$_tmpdir"

greymd

yamayaさんの難読化シェル芸(フィボナッチ数列) 解説

経緯

(1) ある日、yamaya さんという怖い方がこのツイートを投稿する。

! : "`/???/???/???${#?}???<<<_.`";_____=${_::-~$?}
____='__+=___,___=__-___,__<_[$($_____<<<$___>&$[-~${##}])]||____'
((__=-~$?,____))|&$_____#シェル芸

— yamaya (@yamaya) April 6, 2019

(2) シェル芸bot上で実行されたこのシェル芸は、結果として下記のようにフィボナッチ数列を出す。

greymd

import java.util.stream.IntStream;

class Main {
    public static void main(String args[]) {
        IntStream.rangeClosed(2, 100)
            .filter(i -> IntStream.rangeClosed(2, (int)Math.sqrt(i))
                    .allMatch(j -> i%j != 0))
            .forEach(n -> {
                System.out.println(n);
            });

greymd

#!/bin/bash
# From: https://twitter.com/grethlen/status/906154326975905793

sudo ping -i 0 -c 1400 pong4.kooshin.net \
  | grep -oP "icmp_seq=\K\d+" \
  | cat - <(seq 1 1400) \
  | sort -n \
  | uniq -c \
  | awk '{printf $1}' \
  | fold -w70 \

greymd

#!/bin/bash
ceiling () {
  local divide="$1";shift
  local by="$1"
  printf "%s\\n" $(( ( divide + by - 1 ) / by ))
}

equalized_partition_nums () {
  local number="$1";shift
  local count="$1"

greymd

#!/bin/bash

# Try this script on the docker container.
# Tested on macoOS High Sierra + Ubuntu 18.04 docker container.

rm -f "$HOME"/work/*

tmux -S "$HOME"/work/sess new-session -d

printf "%s\\n" A B C D | while read -r f;do

greymd

--------------------
bash 3.2.0
--------------------
~$ bash --version
GNU bash, version 3.2.0(1)-release (x86_64-unknown-linux-gnu)
Copyright (C) 2005 Free Software Foundation, Inc.

~$ [[ "hoge" =~ ho.. ]] && echo "${BASH_REMATCH[0]}"
hoge

greymd

Q1:
<welcome.txt tr '\0' '*' | fold -w 70

初っ端からひどい

Q2:
ls | perl -C -Mutf8 -nle 'printf "mv $_ ";$_ =~ tr/０-９/0-9/ ;$_ =~ tr/A-Z/Ａ-Ｚ/;$_ =~ m/([0-9]).*([Ａ-Ｚ])/; print " $1年$2組.doc"'

Q3:
echo 2018{01..12}{01..31}$'\n' | date -f- +'%Y%m%d' 2>/dev/null | grep -P '([2357].*){4}'

greymd

2017-05-09 20:53:26 INFO --- [thread-1] myapp.logic : Register records
2017-05-09 20:53:26 INFO --- [thread-1] myapp.logic : --> POST https://api.example/v2/records http/1.1
2017-05-09 20:53:27 INFO --- [thread-1] myapp.logic : response: <?xml version="1.0" encoding="UTF-8"?>
<root>
  <records>
    <record>
      <id>A001</id>
      <date>1990-01-04</date>
      <status>0</status>
    </record>