What is the “sys.stdout.write()” equivalent in Ruby?

问题

As seen in Python, what is the sys.stdout.write() equivalent in Ruby?

回答1:

In Ruby, you can access standard out with $stdout or STDOUT. So you can use the write method like this:

$stdout.write 'Hello, World!'

or equivalently:

STDOUT.write 'Hello, World!'

$stdout is a actually a global variable whose default value is STDOUT.

You could also use puts, but I think that is more analogous to python's print.

回答2:

puts (or print if you don't want a newline (\n) automatically appended).

回答3:

puts "Hello, world!"

or print - because it buffered.

回答4:

Here is a one liner for both writing and reading to/from stdin and stdout.

$ ruby -e '$stdout.write "hi\n" '
hi

$ echo "somestring" | ruby -e 'p  $stdin.read'
"somestring\n"

$ echo "somestring" | ruby -e 'puts   $stdin.read'
somestring

来源：https://stackoverflow.com/questions/3265129/what-is-the-sys-stdout-write-equivalent-in-ruby