ruby文件读取写入相关操作
http://www.cnblogs.com/cnblogsfans/archive/2009/09/19/1569918.html
http://www.cnblogs.com/cnblogsfans/archive/2009/09/17/1568804.html
二、读取文件
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file=File.open(File.join("C:","Test.txt"),"r")
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file.each{ |line| print"#{file.lineno}.", line }
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file.close
一、新建文件
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f=File.new(File.join("C:","Test.txt"),"w+")
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f.puts("I am Jack")
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f.puts("Hello World")
文件模式
"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 with any of the key letters listed above