I would like to see the output in a logfile greped by only one domain but also the following two lines.


tail -f /var/log/apache2/modsec_audit.log |grep mydomain.de

this shows all lines, that contain "mydomain.de" but the important information is in the line below the line, where the domain is included

2 Answers 2


grep has extra options to define how many lines before and after the result:

  • -A (after)
  • -B (before)
  • -C (context [before + after])

So in your case you need -A:


the above command prints NUMBER of lines after YOURDOMAIN in file.

  • Please note, however, that this is a GNU extension. If you're on Linux, your grep definitely has this option. If you're not, you better check.
    – Leonid
    Feb 4, 2013 at 8:14

Try passing number of context lines to grep.

| grep -C 5

will print 5 lines before and after the match.

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