Export variable

bash

export APP_ENV=production

Explanation

Needed when subprocesses should receive the value.

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Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

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Assign a shell variable.

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Expand a variable with double quotes.

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Remove a variable definition.

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Use a fallback if variable is unset or empty.

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Assign default if variable is unset or empty.

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Abort expansion with error if variable is missing.

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