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Ruby - Dir Class and Methods
A Dir is a class to represent a directory stream that gives filenames in the directory in the operating system. Dir class also holds directory related operations, such as wild card filename matching, changing current working directory, etc. as class methods.
Class Methods
Sr.No. | Method & Description |
---|---|
1 | Dir[pat] Dir::glob( pat) Returns an array of filenames matching the specified wild card pattern pat −
Dir["foo.*"] # matches "foo.c", "foo.rb", etc. Dir["foo.?"] # matches "foo.c", "foo.h", etc. |
2 | Dir::chdir( path) Changes the current directory. |
3 | Dir::chroot( path) Changes the root directory (only allowed by super user). Not available on all platforms. |
4 | Dir::delete( path) Deletes the directory specified by path. The directory must be empty. |
5 | Dir::entries( path) Returns an array of filenames in directory path. |
6 | Dir::foreach( path) {| f| ...} Executes the block once for each file in the directory specified by path. |
7 | Dir::getwd Dir::pwd Returns the current directory. |
8 | Dir::mkdir( path[, mode=0777]) Creates the directory specified by path. Permission mode may be modified by the value of File::umask and is ignored on Win32 platforms. |
9 | Dir::new( path) Dir::open( path) Dir::open( path) {| dir| ...} Returns a new directory object for path. If open is given a block, a new directory object is passed to the block, which closes the directory object before terminating. |
10 | Dir::pwd See Dir::getwd. |
11 | Dir::rmdir( path) Dir::unlink( path) Dir::delete( path) Deletes the directory specified by path. The directory must be empty. |
Instance Methods
Assuming d is an instance of Dir class −
Sr.No. | Method & Description |
---|---|
1 | d.close Closes the directory stream. |
2 | d.each {| f| ...} Executes the block once for each entry in d. |
3 | d.pos d.tell Returns the current position in d. |
4 | d.pos = offset Sets the position in the directory stream. |
5 | d.pos = pos d.seek(po s) Moves to a position in d. pos must be a value returned by d.pos or 0. |
6 | d.read Returns the next entry from d. |
7 | d.rewind Moves position in d to the first entry. |
8 | d.seek(po s) See d.pos = pos. |
9 | d.tell See d.pos. |
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