Name
IO — I/O class
Synopsis
IO
is
object-oriented representation of stdio
.
IO
is a superclass of other IO related classes,
such as File
, BasicSocket
, etc.
Included Module
Enumerable
Class Methods
IO::foreach(
path
) {|
x
|
...
}
Opens the file and executes the block once for each line, closing the file when the block exits.
n = 1 IO::foreach(path) {|line| print n, ":", lib n+=1 }
IO::new(
fd
[,
mode
="r"])
Returns a new
IO
stream for the specified integer file descriptorfd
.IO::pipe
Creates a pair of
IO
streams connected to each other and returns them as an array([readIO, writeIO]).
IO::popen(
cmd
[,
mode
="r"])
IO::popen(
cmd
[,
mode
="r"]) {|
io
|
...
}
Executes the command specified by
cmd
as a subprocess and creates an associated stream connected to it. Ifcmd
is-
, a new instance of Ruby is started as a subprocess with anIO
object returned in the parent andnil
returned in the child process. If a block is specified, it’s run with theIO
object as a parameter. The stream is closed when the block exits.IO::readlines(
path
)
Returns the contents of a file as an array of strings.
IO::select(
reads
[,
writes
=nil[,
excepts
=nil[,
timeout
=nil]]])
Checks for changes in the status of three types of
IO
objects, input, output, and exceptions, which are passed as arrays ofIO
objects.nil
is passed for arguments that don’t need checking. A three-element array containing arrays of theIO
objects for which there were changes in status is returned.nil
is returned on timeout.IO::select([STDIN], nil, nil, 1.5) # wair data ...
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