Linux Shell Grep with output to text file

Question

I am trying to search through a number of sites on my server for a few key words and output these to a text file. I only know how to do:

 grep -r "keyword1" * grep -r "keyword2" * 

I need to be able to combine both keywords into the search and output the locations into a text file.

Answer 1

TIP: use a regexp for better performance and to combine results

grep -r -E "keyword1|keyword2" * > results

Combining both searches into the one will result in better performance for larger searches. You get both sets of results without the overhead of running grep again.

If you want just the actual matching part (not the whole line) then add the -o option.

Answer 2

#!/bin/bash touch outputfile.txt grep -r "keyword1" * >> outputfile.txt grep -r "keyword2" * >> outputfile.txt 

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This shell script wiil create a empty destination file an the following two commands will append the file. The script file must be executable.