🧵String Manipulation & Parameter Expansion

🔡 Get Length of String

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✂️ Substring Extraction

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🔁 Substring Replacement

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🧪 Check if Variable is Set

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📛 Default and Fallback Values

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❌ Error on Unset Variable

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🧹 Remove Prefix or Suffix

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🔄 Case Modification (Bash 4+)

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🪞 Remove Matching Patterns

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⚙️ Indirect Expansion

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🧩 String Append and Prepend

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🧼 Trim Whitespace (Using Parameter Expansion + Regex)

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📦 Join Array into String

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🔍 Split String into Array

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