To prefix output lines in grep, you can use the -H option, which prints the filename before each matching line. However, if you want to add a custom prefix to each line, you can use sed or awk in combination with grep. Here are examples using both methods:
Using sed:
grep "search_term" filename.txt | sed 's/^/PREFIX: /'This command searches for "search_term" in filename.txt and prefixes each matching line with "PREFIX: ".
Using awk:
grep "search_term" filename.txt | awk '{print "PREFIX: " $0}'This command does the same thing, using awk to print "PREFIX: " followed by the original line.
Feel free to ask if you need further assistance!
