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20140910155530_ruby_STDERR

ruby_STDERR

STDERR への書き出し。2> でリダイレクト。

stderr.rb

 
#! /usr/bin/ruby
# coding: utf-8
 
puts "This is stdout."
STDERR.puts "This is stderr."

 
% stderr.rb
This is stdout.
This is stderr.
 
% stderr.rb 2> err.txt
This is stdout.
 
% cat err.txt         
This is stderr.
 
% stderr.rb > out.txt 2> err.txt
 
% cat out.txt
This is stdout.
 
% cat err.txt                   
This is stderr.