I came across this in a bash script:
excludes+=("${2-}")
What is the meaning of ${2-}?
${2-}
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This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.
The ideal answer would point to a section in the GNU Bash Manual: https://www.gnu.org/software/bash/manual/html_node/
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