How to check for "delta" argument like "+10" – unix.stackexchange.com

How to check for "delta" argument like "+10" – unix.stackexchange.com

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I want to pass a numeric value to a bash script, which could be either an absolute integer value (0-100) or a relative "delta" like "+10" or "-50". How would I parse $1 to check for + or - and grab ...

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