Ruby I/O - Revision history

Scott: /* File Attributes */

2011-10-05T20:37:56Z

File Attributes

← Older revision		Revision as of 20:37, 5 October 2011
Line 41:		Line 41:
	more here:		more here:
	http://www.ruby-doc.org/core/classes/File.html		http://www.ruby-doc.org/core/classes/File.html


			== Command-line arguments ==
			<code>ARGV[0]</code> is the first of the command-line parameters, numbering naturally from zero; it is not the file or script name preceding the parameters, like <code>argv[0]</code> in C.

Scott: /* List a directory */

2011-09-13T21:25:18Z

List a directory

← Older revision		Revision as of 21:25, 13 September 2011
Line 28:		Line 28:

	== List a directory ==		== List a directory ==
			<source lang="ruby">
			list_of_files = Dir.foreach('/some/directory/path')
			</source>


			== File Attributes ==
	<source lang="ruby">		<source lang="ruby">
	~~list_of_files = Dir~~.~~foreach~~('/some/directory/path')		File.exists?('/some/directory/path')
			File.size('/some/directory/path')
	</source>		</source>

			more here:
			http://www.ruby-doc.org/core/classes/File.html

Scott: /* Parsing a File */

2011-02-02T00:14:30Z

Parsing a File

New page

== Parsing a File ==
To extract the contents of a file as a single string:
<source lang="ruby">
lines = open('test.txt').read
</source>

To extract the contents of a file as an array of lines:
<source lang="ruby">
lines = open('test.txt').readlines
</source>

To process a file line-by-line:
<source lang="ruby">
open('test.txt').each do |line|
do something with line
end
</source>

== Write to a file ==

<source lang="ruby">
output = open('output.txt', 'w')
output.puts("Here is the first line")
output.puts("and here is the second line")
</source>

== List a directory ==

<source lang="ruby">
list_of_files = Dir.foreach('/some/directory/path')
</source>