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Check if Variable is Empty in Bash
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Return empty string instead of "null" with "jq --raw-output" ? · Issue #354 · jqlang/jq · GitHub
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Check If Variable Is Empty in Bash [4 Ways] - Java2Blog
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Bash: How to Check if String Not Empty in Linux | DiskInternals
Determining if a Bash String is Empty
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Determining if a Bash String is Empty
How to Include an Empty String in RegEx
