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user310115
Asked: 2018-10-03 07:19:04 +0800 CST

lsof -ad3-999 -c rsync 有什么作用？

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我试图查看已经运行的 rsync 和 cp 任务的进度，并找到了这个答案，让我可以看到当前正在发生的事情

当我转到man页面lsof并看到它-c是用来选择要查看的过程（cp在下面的示例中）时：

   -a       causes list selection options to be ANDed, as described above.

   -b       causes lsof to avoid kernel functions that might block - lstat(2), readlink(2), and stat(2).

但我真的不明白与3-999

做什么lsof -ad3-999 -c cp？

process lsof

1 个回答

  1. Best Answer

    -d3-999只是从列表中排除标准文件描述符 (0,1,2)。-d用于指定 fds 的列表或范围：

    -d s     specifies  a list of file descriptors (FDs) to exclude from or
         include in the output listing.  The file descriptors are spec-
         ified  in  the  comma-separated  set  s  -  e.g., ``cwd,1,3'',
         ``^6,^2''.  (There should be no spaces in the set.)

         The list is an exclusion list if all entries of the set  begin
         with  `^'.   It  is  an inclusion list if no entry begins with
         `^'.  Mixed lists are not permitted.

         A file descriptor number range may be in the set  as  long  as
         neither  member  is  empty,  both members are numbers, and the
         ending member is larger than the starting one - e.g.,  ``0-7''
         or  ``3-10''.   Ranges  may be specified for exclusion if they
         have the  `^'  prefix  -  e.g.,  ``^0-7''  excludes  all  file
         descriptors 0 through 7.

    写这篇文章的人可能放弃理解为什么取反范围不起作用（就像我一样），而是那样写。

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