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How to create documents with Bash scripts
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Sometimes you need to generate multi-line documents with complex nested structures, like YAML or HTML, from inside Bash scripts. You can accomplish this by using some special Bash features, like here documents. A "here doc" is a code or text block that can be redirected to a script or interactive program. Essentially, a Bash script becomes a here doc when it redirects to another command, script, or interactive program.
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