REBOL 3 Docs Guide Concepts Functions Datatypes Errors
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REBOL 3 Functions: script?

script?  source

Checks file, url, or string for a valid script header.


source [file! url! binary! string!]

See also:


If the header is found, the script string will be returned as of that point. If not found, then NONE is returned.

print either script? %file.txt ["found"]["not found"]

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