One, new file
Copy Code code as follows:
F=file.new (File.join ("C:", "Test.txt"), "w+")
F.puts ("I am Jack")
F.puts ("Hello World")
File mode
"R": Read-only. Starts at beginning of file (default mode).
"r+": Read-write. Starts at beginning of file.
"W": Write-only. Truncates existing file to zero length or creates a new file for writing.
"w+": Read-write. Truncates existing file to zero length or creates a new file for reading and writing.
"A": write-only. Starts at end of file if file exists; Otherwise, creates a new file for writing.
"A +": Read-write. Starts at end of file if file exists; Otherwise, creates a new file for reading and writing.
"B": (Dos/windows only.) Binary file mode. May appear and any of the key letters listed above
Second, read the file
Copy Code code as follows:
File=file.open (File.join ("C:", "Test.txt"), "R")
File.each {|line| print "#{file.lineno}.", line}
File.close
Third, new, delete, rename files
Copy Code code as follows:
File.new ("Books.txt", "W")
File.rename ("Books.txt", "Chaps.txt")
File.delete ("Chaps.txt")
Four, directory operation
1 Creating a directory
Copy Code code as follows:
Dir.mkdir ("C:/testdir")
#删除目录
Dir.rmdir ("C:/testdir")
#查询目录里的文件
P Dir.entries (File.join ("C:", "Ruby")). Join (")
#遍历目录
Dir.entries (File.join ("C:", "Ruby")). Each {
|e| Puts E
}
1, ARGV and ARGF
Copy Code code as follows:
Argv
ARGV << "Cnblogslink.txt"
#The gets method are a Kernel method this gets lines from ARGV
Print while gets
P Argv.class
Argf
While line = Argf.gets
Print Line
End
2. File Information Inquiry
Copy Code code as follows:
#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::d irectory? ("C:/ruby") # => True
P File::d irectory? ("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, modification, last access time
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
3. Find Files
Copy Code code as follows:
Puts "Find all files and folders under directory"
dir["c:/ruby/*"].each {|x|
Puts X
}
Puts "conditional query"
Dir.foreach (' C:/ruby ') {
|x| Puts X if x!= "." && x!= "..."
}
Puts "Find a type of file"
dir["*.rb"].each {|x|
Puts X
}
Puts "Open query"
Dir.open (' C:/ruby ') {|d| d.grep/l/}.each{|x| puts X}
Puts "---------------------------"
Puts "Regular expression query"
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 "Find files for directories and subdirectories"
Require ' find '
Find.find ('./') {|path| puts path}
3, query directory and subdirectory files
Copy Code code as follows:
Require "find"
Find.find ("/etc/passwd", "/var/spool/lp1", ".") do |f|
Find.prune if f = = "."
Puts F
End
Prototype: Ref.find ([Aname]*) {| afilename | block}
Prune:skips the current file or directory and restarting the loop with the next entry. If the current file is a directory, that directory won't be recursively entered. Meaningful only within the blocks associated with Find::find.
4, file comparison copy, etc.
Copy Code code as follows:
Require ' ftools '
File.Copy ' testfile ', ' Testfile1 '»true
File.compare ' testfile ', ' Testfile1 '»true
