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    <p>Following are some things I found in my collection of obscure Ruby.</p> <p>So, in Ruby, a simple no-bells implementation of the Unix command <code>cat</code> would be:</p> <pre><code>#!/usr/bin/env ruby puts ARGF.read </code></pre> <p><a href="http://ruby-doc.org/core-2.4.0/ARGF.html" rel="noreferrer"><code>ARGF</code></a> is your friend when it comes to input; it is a virtual file that gets all input from named files or all from STDIN.</p> <pre><code>ARGF.each_with_index do |line, idx| print ARGF.filename, ":", idx, ";", line end # print all the lines in every file passed via command line that contains login ARGF.each do |line| puts line if line =~ /login/ end </code></pre> <p>Thank goodness we didn’t get the diamond operator in Ruby, but we did get <code>ARGF</code> as a replacement. Though obscure, it actually turns out to be useful. Consider this program, which prepends copyright headers in-place (thanks to another Perlism, <code>-i</code>) to every file mentioned on the command-line:</p> <pre><code>#!/usr/bin/env ruby -i Header = DATA.read ARGF.each_line do |e| puts Header if ARGF.pos - e.length == 0 puts e end __END__ #-- # Copyright (C) 2007 Fancypants, Inc. #++ </code></pre> <p>Credit to:</p> <ul> <li><a href="http://www.oreillynet.com/ruby/blog/2007/04/trivial_scripting_with_ruby.html#comment-565558" rel="noreferrer">http://www.oreillynet.com/ruby/blog/2007/04/trivial_scripting_with_ruby.html#comment-565558</a></li> <li><a href="http://blog.nicksieger.com/articles/2007/10/06/obscure-and-ugly-perlisms-in-ruby" rel="noreferrer">http://blog.nicksieger.com/articles/2007/10/06/obscure-and-ugly-perlisms-in-ruby</a></li> </ul>
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    1. POBest practices with STDIN in Ruby?
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    1. COARGF is the way to go. It's Ruby's built in way to handle files and stdin in an all-around fashion.
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    2. CO(saw this and thought of you) re those credits: http://blog.nicksieger.com/articles/2007/10/06/obscure-and-ugly-perlisms-in-ruby
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    3. COThat's very nice. My day will be complete if there's a nice pattern to simulate the way AWK works (with zero or minimal interlocution). :-)
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