Recursively Search through Directories

FileSystemMap will normally evaluate on all files in a given directory.

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dir = FileNameJoin[{$InstallationDirectory, "SystemFiles", "SpellingDictionaries"}];

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Length[Keys[FileSystemMap[FileByteCount, dir]]]

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FileNameForms allows you to select files with a specific pattern in FileSystemMap.

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FileSystemMap[FileByteCount, dir, FileNameForms -> "*en*"]

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FileSystemMap[FileByteCount, dir, FileNameForms -> "*en*"]; Length[Keys[%]]

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Use FileSystemScan with FileNameForms to copy all documentation pages with "Date" in the title to a new directory.

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targetDir = CreateDirectory[FileNameJoin[{$TemporaryDirectory, "new"}]]; docsDir = FileNameJoin[{$InstallationDirectory, "Documentation", "English", "System", "ReferencePages", "Symbols"}];

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copy[file_] := CopyFile[file, FileNameJoin[{targetDir, FileNameTake[file, -1]}]]

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FileNames["*", targetDir]

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FileSystemScan[copy, docsDir, Infinity, FileNameForms -> "*Date*.nb"]

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FileNames["*", targetDir]

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These files can also be removed using FileSystemScan.

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FileSystemScan[DeleteFile, targetDir]

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FileNames["*", targetDir]

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