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1. Convert Decimal to Hexadecimal in Ja... Convert Decimal to Hexadecimal in Javascript

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   // The simple way

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   const hex = (number) => number.toString(16)

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   console.assert(hex(15) === 'f')

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   console.assert(hex(-30) === '-1e')

2. Parse Options Passed to a Bash Script Parse Options Passed to a Bash Script

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   #!/usr/bin/env bash

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   # Paste this into a file, chmod 755 it, and try it out

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   while :; do

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       case $1 in

3. Ruby Shebang Ruby Shebang

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   # with debugging options

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   #!/usr/bin/ruby -w

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   # regular

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   #!/usr/bin/ruby