Linux基本命令列搜尋操作之&&grep命令

1.搜尋包含指定內容的檔案

• 例如：搜尋/root下所有檔案中是否包含"hello spark"的檔案，使用如下命令：

[[email protected] ~]# grep "hello spark" /root/*.*
/root/word.txt:hello spark

• 例如：搜尋指定路徑下的指定檔案是否包含某一個字串，使用如下命令：

[[email protected] ~]# grep "spark" /root/word.txt
hello spark

• 注：實驗環境的檔案如下：

[[email protected]
 
 ~]# ll
total 1
-rw-r--r--.  1 root root      58 Apr  5 02:21 word.txt

2.顯示檔案中包含某字串的行及內容

grep -n [string] [filepath]

[[email protected] ~]# grep -n hadoo /root/word.txt 
4:hello hadoop
7:spark is better than hadoop in streaming calculating
8:But when the data size is at PB level the hadoop is more
 
 effective

3.常用選項

       -i, --ignore-case
              Ignore case distinctions in both the PATTERN and the input files.  (-i is specified by POSIX.)
			  
       -L, --files-without-match
              Suppress normal output; instead print the name of each input file from which no output would normally have been printed.  The scanning will stop on the first match.

       -l, --files-with-matches
              Suppress normal output;
 
 instead print the name of each input file from which output would normally have been printed.  The scanning will stop on the first match.  (-l is specified by
              POSIX.)
       
       -n, --line-number
              Prefix each line of output with the 1-based line number within its input file.  (-n is specified by POSIX.)		  
	   
	   -r, --recursive
              Read all files under each directory, recursively, following symbolic links only if they are on the command line.  This is equivalent to the -d recurse option.