1、打开读取文件
file = File.open( "cnblogslink.txt" )
file.each { |line| print "#{file.lineno}. ", line }
file.close输出:
1. 社区
2. 新闻
3. 社区
4. 新闻
5. 招聘
6. 博问
7. 小组
8. 闪存
9. 网摘
10. .NET频道
file.lineno显示的是行号
2、ARGV and ARGF
ARGV
ARGV << "cnblogslink.txt"#The gets method is a Kernel method that gets lines from ARGV
print while getsp ARGV.class=begin
输出:社区新闻 社区新闻 招聘 博问 小组 闪存 网摘 .NET频道Array
=endARGF
我们在test.rb里写如下代码：
while line = ARGF.getsprint line
end在命令行里执行得到如下结果
c:\studyruby>test.rb cnblogslink.txt cnblogslink2.txt
社区
新闻
社区
新闻
招聘
博问
小组
闪存
网摘
.NET频道
社区
新闻
社区
新闻
招聘
博问
小组
闪存
网摘
.NET频道3、文件信息查询
#文件是否存在
p File::exists?( "cnblogslink.txt" ) # => true#是否是文件
p File.file?( "cnblogslink.txt" ) # => true#是否是目录
p File::directory?( "c:/ruby" ) # => true
p File::directory?( "cnblogslink.txt" ) # => false#文件权限
p File.readable?( "cnblogslink.txt" ) # => true
p File.writable?( "cnblogslink.txt" ) # => true
p File.executable?( "cnblogslink.txt" ) # => false#是否是零长度
p File.zero?( "cnblogslink.txt" ) # => false#文件大小 bytes
p File.size?( "cnblogslink.txt" ) # => 74
p File.size( "cnblogslink.txt" ) # => 74#文件或文件夹
p File::ftype( "cnblogslink.txt" ) # => "file"#文件创建、修改、最后一次存取时间
p File::ctime( "cnblogslink.txt" ) # => Sat Sep 19 08:05:07 +0800 2009
p File::mtime( "cnblogslink.txt" ) # => Sat Sep 19 08:06:34 +0800 2009
p File::atime( "cnblogslink.txt" ) # => Sat Sep 19 08:05:07 +0800 20094、查找文件
puts "查找目录下所有文件及文件夹"
Dir["c:/ruby/*"].each {|x| puts x
} puts "条件查询"
Dir.foreach('c:/ruby') { |x| puts x if x != "." && x != ".."
}puts "查找某一类型文件"
Dir["*.rb"].each {|x| puts x}puts "Open 查询"
Dir.open('c:/ruby') { |d| d.grep /l/ }.each{|x| puts x}puts "---------------------------"
Dir.open('c:/ruby') { |d| d.each { |x| puts x } }puts "正则表达式查询"
Dir["c:/ruby/ruby/[rs]*"].each{|x| puts x} puts "------------------------"
Dir["c:/ruby/[^s]*"].each{|x| puts x}puts "------------------------"
Dir["c:/ruby/{ruby,li}*"].each{|x| puts x} puts "------------------------"
Dir["c:/ruby/?b*"].each{|x| puts x} puts "查找目录及子目录的文件"
require 'find'
Find.find('./') { |path| puts path }以上内容得到以下输出：
>ruby test.rb 查找目录下所有文件及文件夹 c:/ruby/bin c:/ruby/ChangeLog.txt c:/ruby/doc c:/ruby/lib c:/ruby/LICENSE.txt c:/ruby/man c:/ruby/MANIFEST c:/ruby/misc c:/ruby/README.1st c:/ruby/ReleaseNotes.txt c:/ruby/ruby.ico c:/ruby/rubyopt.del c:/ruby/rubyw.ico c:/ruby/samples c:/ruby/scite c:/ruby/share c:/ruby/src c:/ruby/uninstall.exe 条件查询 bin ChangeLog.txt doc lib LICENSE.txt man MANIFEST misc README.1st ReleaseNotes.txt ruby.ico rubyopt.del rubyw.ico samples scite share src uninstall.exe 查找某一类型文件 test.rb test2.rb Open 查询 lib ReleaseNotes.txt rubyopt.del samples uninstall.exe --------------------------- . .. bin ChangeLog.txt doc lib LICENSE.txt man MANIFEST misc README.1st ReleaseNotes.txt ruby.ico rubyopt.del rubyw.ico samples scite share src uninstall.exe 正则表达式查询 ------------------------ c:/ruby/bin c:/ruby/ChangeLog.txt c:/ruby/doc c:/ruby/lib c:/ruby/LICENSE.txt c:/ruby/man c:/ruby/MANIFEST c:/ruby/misc c:/ruby/README.1st c:/ruby/ReleaseNotes.txt c:/ruby/ruby.ico c:/ruby/rubyopt.del c:/ruby/rubyw.ico c:/ruby/uninstall.exe ------------------------ c:/ruby/ruby.ico c:/ruby/rubyopt.del c:/ruby/rubyw.ico c:/ruby/lib c:/ruby/LICENSE.txt ------------------------ 查找目录记子目录的文件 ./ ./test2.rb ./test2 ./test2/test2.rb ./test2/test.rb ./test1 ./test.rb ./output ./films.txt ./cnblogslink2.txt ./cnblogslink.txt ./beans.txt >Exit code: 0
 功能)
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