The ABC's of grep - H

H

Use the -H flag to show the filename header​ in the results.

Let’s return back to our handy test.txt file with the following content:

sad
happy
awake
coffee
work
school

To see the filename header, run:

$ grep -H "awake" test.txt
test.txt:awake

This is the default when searching through multiple files. Let’s make a copy of test.txt and run the grep command for both files.

$ cp test.txt test2.txt
$ grep "awake" test*.txt
test.txt:awake
test2.txt:awake

Use -h if you explicitly don’t want to see the headers:

$ grep -h "awake test*.txt
awake
awake