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Operations on File Names
Mathematica provides a convenient collection of platform-independent functions for manipulating names of files and directories. These functions can also be used to assemble and disassemble file-name-like constructs such as URLs.
FileNameSplit split a file name into directory and name parts
FileNameJoin assemble a file name from a list of components
    
FileNameTake, FileNameDrop take, drop elements from a file name
ExpandFileName textually expand to absolute file name form
AbsoluteFileName determine the absolute name for a file in your filesystem
DirectoryQ test whether a name corresponds to an existing directory
    
FileNames list names of files or directories on your computer system
FileExistsQ test whether a file exists on your computer system
FindFile find a file on $Path, etc.
FileNameSetter interactively browse for a file
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