Returns false
Returns the integer month of the year for self, in range (1..12):
t = Time.new(2000, 1, 2, 3, 4, 5, 6) # => 2000-01-02 03:04:05 +000006 t.mon # => 1
Returns the integer month of the year for self, in range (1..12):
t = Time.new(2000, 1, 2, 3, 4, 5, 6) # => 2000-01-02 03:04:05 +000006 t.mon # => 1
Returns the integer year for self:
t = Time.new(2000, 1, 2, 3, 4, 5, 6) # => 2000-01-02 03:04:05 +000006 t.year # => 2000
Returns the string name of the time zone for self:
Time.utc(2000, 1, 1).zone # => "UTC" Time.new(2000, 1, 1).zone # => "Central Standard Time"
Returns true if self represents a Monday, false otherwise:
t = Time.utc(2000, 1, 3) # => 2000-01-03 00:00:00 UTC t.monday? # => true
Related: Time#tuesday?, Time#wednesday?, Time#thursday?.
Flushes input and output buffers in kernel.
You must require ‘io/console’ to use this method.
Reads and returns a line without echo back. Prints prompt unless it is nil.
The newline character that terminates the read line is removed from the returned string, see String#chomp!.
You must require ‘io/console’ to use this method.
require 'io/console' IO::console.getpass("Enter password:") Enter password: # => "mypassword"
Returns an File instance opened console.
If sym is given, it will be sent to the opened console with args and the result will be returned instead of the console IO itself.
You must require ‘io/console’ to use this method.
Returns true if an IO object is in non-blocking mode.
Enables non-blocking mode on a stream when set to true, and blocking mode when set to false.
This method set or clear O_NONBLOCK flag for the file descriptor in ios.
The behavior of most IO methods is not affected by this flag because they retry system calls to complete their task after EAGAIN and partial read/write. (An exception is IO#syswrite which doesn’t retry.)
This method can be used to clear non-blocking mode of standard I/O. Since nonblocking methods (read_nonblock, etc.) set non-blocking mode but they doesn’t clear it, this method is usable as follows.
END { STDOUT.nonblock = false } STDOUT.write_nonblock("foo")
Since the flag is shared across processes and many non-Ruby commands doesn’t expect standard I/O with non-blocking mode, it would be safe to clear the flag before Ruby program exits.
For example following Ruby program leaves STDIN/STDOUT/STDER non-blocking mode. (STDIN, STDOUT and STDERR are connected to a terminal. So making one of them nonblocking-mode effects other two.) Thus cat command try to read from standard input and it causes “Resource temporarily unavailable” error (EAGAIN).
% ruby -e '
STDOUT.write_nonblock("foo\n")'; cat
foo
cat: -: Resource temporarily unavailable
Clearing the flag makes the behavior of cat command normal. (cat command waits input from standard input.)
% ruby -rio/nonblock -e '
END { STDOUT.nonblock = false }
STDOUT.write_nonblock("foo")
'; cat
foo
Yields self in non-blocking mode.
When false is given as an argument, self is yielded in blocking mode. The original mode is restored after the block is executed.
Waits until the IO becomes ready for the specified events and returns the subset of events that become ready, or a falsy value when times out.
The events can be a bit mask of IO::READABLE, IO::WRITABLE or IO::PRIORITY.
Returns a truthy value immediately when buffered data is available.
Optional parameter mode is one of :read, :write, or :read_write.
You must require ‘io/wait’ to use this method.
Opens the stream, writes the given data to it, and closes the stream; returns the number of bytes written.
When called from class IO (but not subclasses of IO), this method has potential security vulnerabilities if called with untrusted input; see Command Injection.
The first argument must be a string that is the path to a file.
With only argument path given, writes the given data to the file at that path:
IO.write('t.tmp', 'abc') # => 3 File.read('t.tmp') # => "abc"
If offset is zero (the default), the file is overwritten:
IO.write('t.tmp', 'A') # => 1 File.read('t.tmp') # => "A"
If offset in within the file content, the file is partly overwritten:
IO.write('t.tmp', 'abcdef') # => 3 File.read('t.tmp') # => "abcdef" # Offset within content. IO.write('t.tmp', '012', 2) # => 3 File.read('t.tmp') # => "ab012f"
If offset is outside the file content, the file is padded with null characters "\u0000":
IO.write('t.tmp', 'xyz', 10) # => 3 File.read('t.tmp') # => "ab012f\u0000\u0000\u0000\u0000xyz"
Optional keyword arguments opts specify:
Encoding options.
Behaves like IO.write, except that the stream is opened in binary mode with ASCII-8BIT encoding.
When called from class IO (but not subclasses of IO), this method has potential security vulnerabilities if called with untrusted input; see Command Injection.
Writes the given object to self, which must be opened for writing (see Modes); returns the number bytes written. If object is not a string is converted via method to_s:
f = File.new('t.tmp', 'w') f.syswrite('foo') # => 3 f.syswrite(30) # => 2 f.syswrite(:foo) # => 3 f.close
This methods should not be used with other stream-writer methods.
Behaves like IO#write, except that it:
Writes at the given offset (in bytes).
Disregards, and does not modify, the stream’s position (see Position).
Bypasses any user space buffering in the stream.
Because this method does not disturb the stream’s state (its position, in particular), pwrite allows multiple threads and processes to use the same IO object for writing at various offsets.
f = File.open('t.tmp', 'w+') # Write 6 bytes at offset 3. f.pwrite('ABCDEF', 3) # => 6 f.rewind f.read # => "\u0000\u0000\u0000ABCDEF" f.close
Not available on some platforms.
Writes each of the given objects to self, which must be opened for writing (see Access Modes); returns the total number bytes written; each of objects that is not a string is converted via method to_s:
$stdout.write('Hello', ', ', 'World!', "\n") # => 14 $stdout.write('foo', :bar, 2, "\n") # => 8
Output:
Hello, World! foobar2
Related: IO#read.
Reads and returns the next 1-character string from the stream; raises EOFError if already at end-of-stream. See Character IO.
f = File.open('t.txt') f.readchar # => "F" f.close f = File.open('t.rus') f.readchar.ord # => 1090 f.close
Invokes Posix system call ioctl(2), which issues a low-level command to an I/O device.
Issues a low-level command to an I/O device. The arguments and returned value are platform-dependent. The effect of the call is platform-dependent.
If argument argument is an integer, it is passed directly; if it is a string, it is interpreted as a binary sequence of bytes.
Not implemented on all platforms.
Returns the path associated with the IO, or nil if there is no path associated with the IO. It is not guaranteed that the path exists on the filesystem.
$stdin.path # => "<STDIN>" File.open("testfile") {|f| f.path} # => "testfile"
Removes all elements and returns self.
set = Set[1, 'c', :s] #=> #<Set: {1, "c", :s}> set.clear #=> #<Set: {}> set #=> #<Set: {}>