FileNameJoin

FileNameJoin[{"name1","name2",…}]

joins the namei together into a file name suitable for your current operating system.

FileNameJoin[{CloudObject[…],"name2",…}]

joins the namei to the path in the specified cloud object.

FileNameJoin[{LocalObject[…],"name2",…}]

joins the namei to the path in the specified local object.

FileNameJoin["name1","name2", …]

is equivalent to FileNameJoin[{"name1","name2",…}].

Details and Options

  • The "namei" can be either individual names or file paths containing pathname separators.
  • FileNameJoin[{"","name1",…}] gives an absolute file path beginning with a pathname separator.
  • FileNameJoin[…,OperatingSystem->"os"] yields a file name in the format for the specified operating system. Possible choices are "Windows", "MacOSX", and "Unix".
  • FileNameJoin just assembles a file name; it does not actually search for the file specified.
  • FileNameJoin["name"] canonicalizes the file name "name", making pathname separators appropriate for your operating system.
  • FileNameJoin[{URL["file:///path"],"name2",…}] joins the namei to the path in the specified file-based URL. »

Examples

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Basic Examples  (3)

Give a system-dependent file name:

Append the file name to a path:

Construct a cloud object from a directory cloud object and a file name:

Scope  (3)

Append file name to a cloud object:

Append paths to a local object:

Append paths to a file-based URL:

Applications  (1)

Get the path to a subdirectory of $LocalBase:

Properties & Relations  (2)

On Windows, the share name is treated as a single unit:

FileNameJoin is the inverse of FileNameSplit:

Possible Issues  (1)

Deploying to a cloud path generated with FileNameJoin will fail if the parent object is not a directory:

Wolfram Research (2008), FileNameJoin, Wolfram Language function, https://reference.wolfram.com/language/ref/FileNameJoin.html (updated 2024).

Text

Wolfram Research (2008), FileNameJoin, Wolfram Language function, https://reference.wolfram.com/language/ref/FileNameJoin.html (updated 2024).

CMS

Wolfram Language. 2008. "FileNameJoin." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2024. https://reference.wolfram.com/language/ref/FileNameJoin.html.

APA

Wolfram Language. (2008). FileNameJoin. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/FileNameJoin.html

BibTeX

@misc{reference.wolfram_2025_filenamejoin, author="Wolfram Research", title="{FileNameJoin}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/FileNameJoin.html}", note=[Accessed: 24-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_filenamejoin, organization={Wolfram Research}, title={FileNameJoin}, year={2024}, url={https://reference.wolfram.com/language/ref/FileNameJoin.html}, note=[Accessed: 24-July-2025 ]}