当路径中有FIFO时,如何递归grep

Question

我想做一个递归的grep.通常我会做以下事情:

grep pattern -r /some/path

通常这会起作用.但是,当FIFO文件驻留在路径中时,grep会卡在那里.

johnson@ISD32_54_sles10:~/tmp$ ls -l 1
prw-r--r-- 1 neoli users 0 2012-05-16 17:24 1

然后我调用strace命令来识别问题,我得到了这个.

...
stat64("./1", {st_mode=S_IFIFO|0644, st_size=0, ...}) = 0
open("./1", O_RDONLY|O_LARGEFILE) = 3
read(3,  <unfinished ...>

所以我的问题是当路径中有FIFO时如何进行递归grep？grep是否有一个命令行选项,它会告诉grep在指定时忽略FIFO？

谢谢你的帮助.

Answer 1

来自man grep(GNU)

-D ACTION, --devices=ACTION

   If  an  input  file is a device, FIFO or socket, use ACTION to process it.
   By default, ACTION is read, which means that devices are read just as if
   they were ordinary files.  If ACTION is skip,  devices  are  silently skipped.