海量文件拷贝（Windows/Linux）
$ rsync -a --stats --dry-run /lib ~/fakeNumber of files: 19,375 (reg: 16,015, dir: 3,052, link: 308)
Number of created files: 19,375 (reg: 16,015, dir: 3,052, link: 308)
Number of deleted files: 0
Number of regular files transferred: 16,015
Total file size: 830,561,043 bytes #含普通文件、链接文件的大小，目录大小计数为0
Total transferred file size: 830,555,045 bytes #普通文件大小
Literal data: 0 bytes
Matched data: 0 bytes
File list size: 0
File list generation time: 0.001 seconds
File list transfer time: 0.000 seconds
Total bytes sent: 471,220
Total bytes received: 61,277
sent 471,220 bytesreceived 61,277 bytes1,064,994.00 bytes/sec
total size is 830,561,043speedup is 1,559.75 (DRY RUN)
# 普通文件大小
# find 的 print0 参数与 xargs -0 参数是为了避免文件名中的特殊字符
$ sudo find /lib -type f -print0 | xargs -0 ls -lad | awk -F ' ' 'BEGIN{sum=0} {sum+=$5} END{printf "%d bytes\n", sum}'
830555045 bytes
# 目录文件大小
# 注意目录文件大小与目录一级文件数量有关，可能大于4096（磁盘块大小）
# 所以 4096 * 目录个数 <= 目录文件大小之和
$ sudo find /lib -type d -print0 | xargs -0 ls -lad | awk -F ' ' 'BEGIN{sum=0} {sum+=$5} END{printf "%d bytes\n", sum}'
12656640 bytes
# 链接文件大小
$ sudo find /lib -type l -print0 | xargs -0 ls -lad | awk -F ' ' 'BEGIN{sum=0} {sum+=$5} END{printf "%d bytes\n", sum}'
5998 bytes
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