From: Joel VanderWerf <vjoel@...>
Date: 2007-08-27T06:05:18+09:00
Subject: Re: [SOLUTION][QUIZ] ID3 Tags (#136)

Johannes Held wrote:
> What the heck is ARGF?

It's a pseudo-IO that reads the concatenation of the files named in 
ARGV, unless ARGV is empty, in which case it just reads standard input. 
It's very useful in writing little command-line programs that can be 
used as filters or on a list of named files (after you delete any 
switches or options from the command line).

[~] cat >foo.txt
foo
[~] cat >bar.txt
bar
[~] ruby -e 'puts ARGF.read' foo.txt bar.txt
foo
bar

[~] echo zap | ruby -e 'puts ARGF.read'
zap

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407