It searches the files for the pattern and prints the lines that contain strings matching the pattern. You may overwrite or append the result to a file, depending on your requirement.Grep is a program for searching a given string pattern in files. It is very useful to look for specific strings from files that are updated regularly, such as server logs, and filter the result to another files. In this article, we have looked at how to save output of grep command to file. Now, every day at 10am grep command will search data.txt for “test” string and append the output to result.txt file. 0 10 * * * sudo grep 'test' /home/data.txt > /etc/result.txt $ crontab -eĪdd the following line to run the above grep command every day at 10 am. If you want to automate this task, you can simply create a cronjob for it.

In this case, the result of grep command will simply be appended to result.txt. In the above statement, if you do not specify full file paths grep will look for these files in your present working directory. Here is an example to search “test” in our file /home/data.txt and append to file /etc/result.txt $ sudo grep 'test' /home/data.txt > /etc/result.txt In the above statement also you need to specify search string, path of the file to be searched (old_file_path) and path of the file (new_file_path) to which you want to append the grep result. $ sudo grep search_string old_file_path > new_file_path In this case, we will append the result of grep command to new file, instead of overwriting it, using > operator, instead of using > operator. If you only want to append the grep result to this file, follow the steps below. Also, its content will be completely overwritten with the result of grep command. Also if the destination file result.txt does not exist, it will be newly created. Here is an example to search “test” in our file /home/data.txt and write to file /etc/result.txt $ sudo grep 'test' /home/data.txt > /etc/result.txt In the above statement, you need to mention search string, the file where you want grep to search (old_file_path) and the file where you want grep to write the result (new_file_path). Here is the syntax $ sudo grep search_string old_file_path > new_file_path You can easily write grep output to another file using > operator. Here is how to save grep output to file in Linux. In this article, we will look at a couple of ways to easily save grep output to file in Linux.

Sometimes you may need to write grep output to file in Linux for later use.

Grep options linux