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yanchenko
Asked: 2009-10-10 07:12:55 +0800 CST

rm {} + 做什么？

  • 772

如在

find -L /etc/ssl/certs/ -type l -exec rm {} +

所以它会找到所有损坏的符号链接并删除它们。但是我究竟该如何解释这{} +部分呢？

unix

2 个回答

  1. 来自man find：

       -exec command {} +
   This variant of the -exec option runs the specified  command  on
   the  selected  files, but the command line is built by appending
   each selected file name at the end; the total number of  invoca-
   tions  of  the  command  will  be  much  less than the number of
   matched files.  The command line is built in much the  same  way
   that  xargs builds its command lines.  Only one instance of '{}'
   is allowed within the command.  The command is executed  in  the
   starting directory.

    所以它会调用命令：

    rm [filename1] [filename2] [...] [lastfilename]

    如果文件数量超出参数列表的容量，rm则将多次调用。（这就是这样xargs做的。）

    没有它，{} +它只会调用rm很多次而没有参数。

    • 12
  2. Best Answer

    该{}位是exec命令的占位符。find 找到的任何文件都将插入以代替括号。建立一长串找到的文件并立即对所有文件调用 exec的方法，而不是像更传统的变体+那样一次一个。-exec {} \;

    • 6

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