fnExtension function

Change file name extension

Very simple but often applicable function to retrieve or change the file name extension (from say file.lst to file.mod)

fnExtension(fn, ext)

Arguments

• fn: file name. Often ending in an extension after a period but the extension is not needed.
• ext: new file name extension. If omitted or NULL, the extension of fn is returned.

Returns

A text string

Examples

fnExtension("file.lst",".mod")
fnExtension("file.lst","mod")
fnExtension("file.lst","..mod")
fnExtension("file.lst",cc(.mod,xml))
fnExtension(cc(file1.lst,file2.lst),cc(.xml))
fnExtension(cc(file1.lst,file2.lst),cc(.xml,.cov))
fnExtension("file.lst","")
fnExtension("file.lst")