Ruby文件操作

获取不带目录的文件名（带有后缀）

File.basename( "foo/bar/jim-jam/whee.html" )       #=> "whee.html"

获取文件名（不带后缀）

File.basename( "foo/bar/jim-jam/whee.html", ".*" ) #=> "whee"

获取同一个目录下不同后缀的文件

filename  = File.basename(my_path,".*")
othername = File.join( File.dirname(my_path), "#{filename}.jpg" )

或者

othername = my_path.sub(/[^.]+\z/,"jpg")  # replace non-period characters at the end of the string with 'jpg'

参考：

http://ruby-doc.org/core-2.2.0/File.html

http://phrogz.net/filename-without-extension-ruby

http://stackoverflow.com/questions/23356777/ruby-get-filename-without-the-extensions

http://stackoverflow.com/questions/374326/get-filename-without-extension-from-file-path-in-ruby

irb(main):024:0> f = 'C:\foobar\blah.txt'.gsub("\\","/") => "C:/foobar/blah.txt" irb(main):027:0> File.basename(f,File.extname(f)) => "blah"