| Sys.glob {base} | R Documentation |
Function to do wildcard expansion (also known as ‘globbing’) on file paths.
Sys.glob(paths, dirmark = FALSE)
paths |
character vector of patterns for relative or absolute filepaths. Missing values will be ignored. |
dirmark |
logical: should matches to directories from patterns
that do not already end in |
The glob system call is not part of Windows, and we supply a
partial emulation.
Wildcards are * (match zero or more characters) and ? (match
a single character). If a filename starts with . this must be
matched explicitly.
In addition, [ begins a character class. If the first
character in [...] is not !, this is a character class
which matches a single character against any of the characters
specified. The class cannot be empty, so ] can be included
provided it is first. If the first character is !, the
character class matches a single character which is none of the
specified characters.
Character classes can include ranges such as [A-Z]: include
- as a character by having it first or last in a class. (In the
current implementation ranges are in numeric order of Unicode points.)
One can remove the special meaning of ?, * and
[ by preceding them by a backslash (except within a
character class). Note that on Windows ? and * are not
valid in file names, so this is mainly for consistency with other
platforms.
File paths in Windows are interpreted with separator \ or
/. Paths with a drive but relative (such as c:foo\bar)
are tricky, but an attempt is made to handle them correctly. An
attempt is made to handle UNC paths starting with a double
backslash. UTF-8-encoded paths not valid in the current locale can be
used.
A character vector of matched file paths. The order is
system-specific (but in the order of the elements of paths): it
is normally collated in either the current locale or in byte (ASCII)
order; however, on Windows collation is in the order of Unicode
points.
Directory errors are normally ignored, so the matches are to accessible file paths (but not necessarily accessible files).
Quotes for handling backslashes in character strings.
## Not run: Sys.glob(file.path(R.home(), "library", "*", "R", "*.rdx")) ## End(Not run)