Regurgitating the contents of a file

[Philip Mak]

What's the shortest way to regurgitate the contents of a file? I mean
like this:

# Perl code
open(FILE, "filename.txt");
print while <FILE>;
close(FILE);

Can I do something like:

stdout << File.new("filename.txt");

or something?

 

[Daniel Carrera]

What's the shortest way to regurgitate the contents of a file? I mean
like this:

# Perl code
open(FILE, "filename.txt");
print while <FILE>;
close(FILE);

Can I do something like:

stdout << File.new("filename.txt");

or something?

puts File.open("filename.txt").to_a


Cheers,

 

[Sam Roberts]

If you don't want the whole file in-memory, maybe look at copy_stream
from file_utils:

http://www.ruby-doc.org/docs/rdoc/1.9/classes/FileUtils.html#M001407

Cheers,
Sam

Quoteing (e-mail address removed), on Mon, Jan 26, 2004 at 08:16:01AM +0900:

 

[Joel VanderWerf]

What's the shortest way to regurgitate the contents of a file? I mean
like this:

puts File.read("filename.txt")

 

[Robert Klemme]

puts File.read("filename.txt")

This is problematic for large files since it reads the complete file into
one string before writing it again. These idioms are more like the perl
variant, since they read only one line at a time:

File.open("filename.txt") do |io|
line = nil
print line while ( line = io.gets )
end

File.open("filename.txt") do |io|
while ( line = io.gets )
print line
end
end

File.open("filename.txt") do |io|
while ( line = io.gets ); print line; end
end

File.open("filename.txt") do |io|
io.each {|line| print line}
end

on one line:
File.open("filename.txt") {|io| io.each {|line| print line} }

Regards

robert

 

[Ged]

What's the shortest way to regurgitate the contents of a file? I mean
like this:

# Perl code
open(FILE, "filename.txt");
print while <FILE>;
close(FILE);

Can I do something like:

stdout << File.new("filename.txt");

or something?

IO.foreach("filename.txt") {|x| print x }

 

[Phil Tomson]

What's the shortest way to regurgitate the contents of a file? I mean
like this:

# Perl code
open(FILE, "filename.txt");
print while <FILE>;
close(FILE);

Can I do something like:

stdout << File.new("filename.txt");

or something?

File.foreach("filename.txt") {|line| puts line }

Or if you prefer:

File.foreach("filename.txt") {|line| $stdout << line }

Phil

 

[Josef 'Jupp' SCHUGT]

Hi!

* Joel VanderWerf:

puts File.read("filename.txt")

AFAIK that reads the whole file to memory while

File.open("filename.txt") {|f| f.each {|l| puts l}}

reads one line at a time. One should add that this only works because
puts does not add a line break to strings that already end in one. It
would be better to send the String object a chomp message:

File.open("filename.txt") {|f| f.each {|l| puts l.chomp}}

Nevertheless that only plays a role when doing something more
complicated with l.

Josef 'Jupp' SCHUGT

 

[Joel VanderWerf]

Hi!

* Joel VanderWerf:



AFAIK that reads the whole file to memory while

It certainly does. But the OP did say "shortest" ;-)

 

[Ara.T.Howard]

Date: Tue, 27 Jan 2004 04:38:03 +0900
From: Joel VanderWerf <[email protected]>
Newsgroups: comp.lang.ruby
Subject: Re: Regurgitating the contents of a file


It certainly does. But the OP did say "shortest" ;-)

irb(main):001:0> 'puts File.read("filename.txt")'.size
=> 30

irb(main):002:0> '`cat filename.txt`'.size
=> 20

;-)

-a
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