Built-in Mathematica Symbol

FileNames

FileNames[]
lists all files in the current working directory.

FileNames[form]
lists all files in the current working directory whose names match the string pattern form.

FileNames[{form₁, form₂, ...}]
lists all files whose names match any of the form_i.

FileNames[forms, {dir₁, dir₂, ...}]
lists files with names matching forms in any of the directories dir_i.

FileNames[forms, dirs, n]
includes files that are in subdirectories up to n levels down.

File names can be given as literal strings, StringExpression string patterns, RegularExpression objects, or abbreviated string patterns.

In abbreviated string patterns, * stands for any sequence of zero or more characters. @ stands for any sequence of one or more characters other than upper-case letters.

In abbreviated string patterns, Verbatim["s"] specifies that the string "s" should be matched with * and @ treated literally.

FileNames[forms, dirs, Infinity] looks for files in all subdirectories of the dirs.

The list of files returned by FileNames is sorted in the order generated by the function Sort.

FileNames[forms, dirs, n] includes names of directories only if they appear exactly at level n.

The forms can include relative or absolute directory specifications, in addition to names of files.

Setting the option IgnoreCase->True makes FileNames treat lower- and upper-case letters in file names as equivalent.

With the default setting IgnoreCase->Automatic, FileNames treats lower- and upper-case letters in file names as equivalent under Microsoft Windows operating systems, but not elsewhere.

List the file and directory names in the $InstallationDirectory: