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Often you will want to provide a default for arguments not explicitly provided by the user. This can be done using this rather odd syntax, with ":-" characters separating the positional argument number from the desired default. The entire defaulting construct is enclosed in "${ }".
| Code Block | ||
|---|---|---|
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textArg=${1:-"text default for 1st argument"}
integerArg=${2:-54321} |
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Importantly, auto_log reports an error and terminates script execution if no tag string is specified (we'll see much more on error handling shortly).
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