1、打开读取文件
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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
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ARGV
<<
"cnblogslink.txt"
#The gets method is a Kernel method that gets lines from ARGV
print
while
gets
p
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
=
end
|
ARGF
我们在test.rb里写如下代码：
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while
line =
ARGF
.gets
print line
end
|
在命令行里执行得到如下结果
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|
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
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#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 2009
|
4、查找文件
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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：
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|
>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
|
王德水
