Some egrep pipe examples for Apache access logs on Ubuntu Linux
egrep http status code 301 entries
$ cat /var/log/apache2/access_log.2015-11-29 | egrep " 301 "
egrep http status code 301 or 302 entries
Approach 1
$ cat /var/log/apache2/access_log.2015-11-29 | egrep " (301|302) "
Approach 2
$ cat /var/log/apache2/access_log.2015-11-29 | egrep " 30(1|2) "
Note the presence of brackets on both approaches.
