Analyze apache/nginx access logs

Show logs for the specific error code

cat /var/log/access.log | awk '($9 ~ /400/)'

Show access logs with non 200 response code

cat /var/log/access.log | grep -F 'stripe/webhooks' |  awk '($9 !~ /200/)'

Show unique user agents

cat /var/log/access.log | grep -F '/rest/' | awk -F\" '($2 ~ "^GET /"){print $6}'