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Retrieves a file. It takes the following arguments:
[MANDATORY] The -i The id of the file to perform the operation on.
[MANDATORY] -c The id for of the collection to to retrieve the file forfrom.
[OPTIONAL] -p The id of the pillar where the file should be retrieved from. If no argument, then the file will be retrieved from the fastest pillars.
[OPTIONAL] -l The location where the file should be placed (either total path or directory). If no argument, then in the directory where the script is located.
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