Grep command series: how to find files based on the file content in UNIX

Grep command series: how to find files based on the file content in UNIX

To complete the course assignments, I wrote a lot of C-language code and saved them as/home/user/c/*. c and *. h. In the UNIX shell window, how can I find a file through a string or word (for example, the function name main?

You need to use the following tools:

[A] grep command: output the matching mode line.

[B] find command: find files at the directory level.

 

Use the grep command to search for files based on the Content

Enter the following command:

1. grep'string'*.txt
2. grep'main('*.c
3. grep'#include<example.h>'*.c
4. grep'getChar*'*.c
5. grep-i 'ultra'*.conf
6. grep-iR 'ultra'*.conf

Where

• -I: Case sensitivity of the ignore mode (matching string valid, VALID, and ValID) and input file (matching FILE. c FILE. c file. C.
• -R: recursively reads all files in each directory.

 

Highlighted matching mode

You can easily highlight a large number of files when searching:

1. $ grep--color=auto-iR 'getChar();'*.c

 

Display the file name and row number for the searched Mode

You may need to display the file name and row number:

1. $ grep--color=auto-iRnH 'getChar();'*.c

Where,

• -N: add a line number starting with 1 before each output line.

• -H: print the file name for each matching file. This is the default option when you want to search for multiple files. (LCTT :-h option forcibly hides the file name. In addition, the-l and-L options are used to only display the matching/mismatched file names, -H and-h are used to control whether to display/not display the file name before displaying matching rows. Note the difference .)

1. $grep --color=auto-nH 'DIR'*

Output example:

Figure 01: The grep command displays the searched mode.

You can also use the find command:

1. $ find.-name "*.c"-print|xargsgrep"main("

Grep uses concise and Regular Expressions

Shell programming in Linux -- basic use of the grep command

Grep command details and related examples

Linux basic commands-grep

Set grep to highlight matching items

Linux grep command learning and summary

Example of 14 grep commands

Via: http://www.cyberciti.biz/faq/unix-linux-finding-files-by-content/

Author: Vivek Gite Translator: ictlyh Proofreader: wxy

This article was originally compiled by LCTT and launched with the honor of Linux in China

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