grep：搜索一次不同的模式，并输出到几个文件 [英] grep: search once for different pattern and output to several files

问题描述

是否有可能告诉grep使用不同的输出文件为每个类型的匹配搜索字符串？

我需要搜索所有* .log递归查找所有 [错误]，[警告]和[ASSERT]。但我想分开在不同的输出文件。每个搜索字符串一个输出文件。 （没有调用grep几次！）

搜索已经工作：（从gmake调用）

  grep -nHr --include = *。log -e'\ [ERROR \]'-e'\ [WARN\]'-e'\ [ASSERT\]'$ （root_path）> $（root_path）/result.txt 
  

但由于性能，我不想多次调用grep ：

$ $ p $ grep -nHr --include = * .log -e'\ [ERROR\]'$（root_path） > $（root_path）/ result_ [ERROR] .txt

grep -nHr --include = *。log -e'\ [WARN\]'$（root_path）> $（root_path）/ result_ [WARN] .txt

有没有可能让它有点像：

  grep -nHr --include = *。log -e {'PATTERN1'| 'PATTERN2'| 'PATTERN3'} $（root_path）> $（root_path）/ result {'PATTERN1'|'PATTERN2'|'PATTERN3'} .txt 
  

解决方案

通过1遍读取文件，并写入多个outFiles，我会使用 awk

  awk'/ ^ \ [Error \] / {print FILENAME：NR：$ 0> errorFile.txt} 
 / ^ \ [Warn \] / {print FILENAME：NR：$ 0> warnFile.txt} 
 / Assert / {print FILENAME：NR：$ 0> assertFile.txt}'logFile 
  

如果您知道确定错误/警告/断言标记总是在感兴趣的线上，并使用开始行reg-exp char（ ^ ），即

  / ^错误/ {print $ 0> errorFile.txt
  

Is it possible to tell grep to use different output files for every type of matching search string?

I need to search all *.log recursively to find all "[ERROR]", "[WARN]" and "[ASSERT]". But I would like to have it separated in different output files. One output file for each search string. (without calling grep several times!)

searching already works: (called from gmake)

grep -nHr --include=*.log -e '\[ERROR\]' -e '\[WARN\]' -e '\[ASSERT\]' $(root_path) > $(root_path)/result.txt

But due to performance I do not want to call grep several times:

grep -nHr --include=*.log -e '\[ERROR\]' $(root_path) > $(root_path)/result_[ERROR].txt

grep -nHr --include=*.log -e '\[WARN\]' $(root_path) > $(root_path)/result_[WARN].txt

Is it possible to have it somehow like:

grep -nHr --include=*.log -e {'PATTERN1' | 'PATTERN2' | 'PATTERN3'} $(root_path) > $(root_path)/result{'PATTERN1'|'PATTERN2'|'PATTERN3'}.txt

解决方案

To read thru the file in 1 pass, and write to multiple outFiles, I would use awk

  awk '/^\[Error\]/ {print FILENAME ":" NR ":" $0 > "errorFile.txt" }
       /^\[Warn\]/ {print FILENAME ":" NR ":" $0 > "warnFile.txt" }
       /Assert/ {print FILENAME ":" NR ":" $0 > "assertFile.txt" }'  logFile

You can gain a minor increase in speed, if you know for certain that the Error/Warn/Assert tokens are always the first on the line of interest and use the beginning-of-line reg-exp char (^), ie.

/^Error/ {print $0 > "errorFile.txt" 

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