Section: Tests and Conditionals

Test for empty string

bash
bash
if [[ -z "$name" ]]; then echo empty; fi
Explanation

Quote variable expansions inside tests.

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Compare string values.
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Check whether a regular file exists.
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Check whether a directory exists.
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Use arithmetic context for integer comparisons.
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Test command success
Use a command directly as the condition.
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Match one variable against several patterns.
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