Filter requests to Rails (2.3.x) application by IP address

log_filter.sh

#!/bin/bash
# Filter requests to Rails application by IP address
#
# Usage:
#   tail -f log/production.log | log_filter.sh [IP]
#
#   By default tries to obtain current IP address from $SSH_CLIENT or by querying http://ifconfig.me
if [[ $# -eq 0 ]]; then
  if [[ -z $SSH_CLIENT ]]; then
    ip=$(curl -s http://ifconfig.me)
  else
    ip=$(echo $SSH_CLIENT | sed -e "s/ .*//")
  fi
else
  ip=$1
fi

output=false

while read line; do
  if [[ $line =~ ^Processing ]]; then
    if [[ $line =~ $ip ]]; then
      output=true
    else
      output=false
    fi
  fi
  $output && echo $line
done

updated with awk and example of my log file, seams like we have different formats

you're right, this works for Rails 2.3.x log format