Filename extensions

Get or change a filename extension

extension(filename, value=NULL, maxchar=10)
extension(filename) <- value

Arguments

filename

A filename, with or without the path

value

A file extension with or without a dot, e.g., ".txt" or "txt"

maxchar

Maximum number of characters after the last dot in the filename, for that string to be considered a filename extension

Value

A file extension, filename or path.

If ext(filename) is used without a value argument, it returns the file extension; otherwise it returns the filename (with new extensions set to value

Examples

fn <- "c:/temp folder/filename.exten sion"
extension(fn)
#> [1] ""
extension(fn) <- ".txt"
extension(fn)
#> [1] ".txt"
fn <- extension(fn, '.document')
extension(fn)
#> [1] ".document"
extension(fn, maxchar=4)
#> [1] ""