如何在Ruby中获取目录中文件的总大小

Question

I am trying to copy some files into a directory using Ruby, i need to assure the files inside the directory not exceed 2GB. is there any way to check the total size of files inside the directory.

Answer 1

Just mydir :

Dir['mydir/*'].select { |f| File.file?(f) }.sum { |f| File.size(f) }

mydir and all subdirectories:

Dir['mydir/**/*'].select { |f| File.file?(f) }.sum { |f| File.size(f) }

However, it's the sum of exact file sizes, not the space they occupy on the disk. For disk usage, this is more accurate:

Dir['mydir/*'].select { |f| File.file?(f) }.sum { |f| File.stat(f).blocks * 512 }

Answer 2

For Unix-flavoured OS's, it may be easiest to simply shell out to the operating system to use the du command.

For example

du -bs #=> 1214674782

is the disk space in bytes consumed by my computer's current directory and its nested subdirectories.

du ../.rvm/src -bs #=> 722526755

is the same for a specified directory. Within Ruby, you can use the Kernel#system command:

s = system("du -bs") #=> 1214674782

To obtain the bytes consumed by the current directory only (and not nested subdirectories) remove "b" from the flags.

s = system("du -s") #=> 1301136

Note disk space consumption is somewhat more than the total of all file sizes, but that could be a better measure of what you are looking for.

Answer 3

In Windows, You can use win32ole gem to calculate the same

 require 'win32ole'

 fso = WIN32OLE.new('Scripting.FileSystemObject')

 folder = fso.GetFolder('directory path')

  p folder.name

  p folder.size

 p folder.path