Fast way to delete files in linux (快速删除大量文件的方式）
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refer to: http://www.slashroot.in/which-is-the-fastest-method-to-delete-files-in-linux
result: (conclusion: using find is the safe way, perl is the fastest, rsync is not a bad choice )
COMMAND TIME TAKEN RM Command Is not capable of deleting large number of files Find Command with -exec 14 Minutes for half a million files Find Command with -delete 5 Minutes for half a million files Perl 1 Minute for half a million files RSYNC with -delete 2 Minute 56 seconds for half a million files