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Android: Generate Release/Debug Keystores

Generate Keystores

Debug Keystore

$ keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000 -dname "C=US, O=Android, CN=Android Debug"

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-- Get Max ID from table
SELECT MAX(id) FROM table;

-- Get Next ID from table
SELECT nextval('table_id_seq');

-- Set Next ID Value to MAX ID
SELECT setval('table_id_seq', (SELECT MAX(id) FROM table));

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Modern Unix Commands

old unix-command	modern unix-command
cat	bat
ls	exa, lsd
diff	delta
du	dust, ncdu
df	duf
tree	broot

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One-line Web Servers

Python 2.x

python -m SimpleHTTPServer 8080

Python 3.x

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sudo find /var/lib/caddy/.local/share/caddy/certificates -type f -exec rm {} \;
sudo systemctl restart caddy

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# curl - Raw upload

curl -X PUT -T image.png https://example.com/upload

# curl - Content-Type: multipart/form-data

curl -F name=logo -F file=@image.png https://example.org/upload

# curl - POST presigned URL (S3)

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One-line Random String Generator

Python

CSPRNG (Cryptographically Secure Pseudo-Random Number Generator) functions:

• os.urandom(n): return a string of n random bytes.
• random.SystemRandom(): provides random functions that uses os.urandom().

Note: Don't use random module for PRNG for security purposes.

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CFG CSGO

Criar cfg

host_writeconfig mycfg

Executar uma cfg

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ROM ruby:2.2.3

RUN apt-get update -qq && apt-get install -y build-essential

RUN apt-get install -y libpq-dev
RUN apt-get install -y ghostscript

RUN mkdir /app
WORKDIR /app

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Javascript

function cpfMask(cleanValue) {
  return cleanValue.replace(/^(\d{3})(\d{3})(\d{3})(\d{2}).*/, '$1.$2.$3-$4');
}

function cnpjMask(cleanValue) {
  return cleanValue.replace(/^(\d{2})(\d{3})(\d{3})(\d{4})(\d{2}).*/, '$1.$2.$3/$4-$5');
}