Simple Bash Script to use OS X 10.4 as a firewall

There was an unused Apple desktop machine running OS X 10.4 sitting around, so I decided to use it as a storage for our company's firewall log. The current log is then rotated and saved in /private/var/log/archived. Here's the script:

#!/bin/bash
echo Stopping Syslog...
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.syslogd.plist
sleep 1

echo ""
printf %s "Rotating log files:"
cd /var/log
for i in edmonton.log; do
    if [ -f "${i}" ]; then
        printf %s " ${i}"
        if [ -x /usr/bin/gzip ]; then gzext=".gz"; else gzext=""; fi
        if [ -f "${i}.6${gzext}" ]; then mv -f "${i}.6${gzext}" "${i}.7${gzext}"; fi
        if [ -f "${i}.5${gzext}" ]; then mv -f "${i}.5${gzext}" "${i}.6${gzext}"; fi
        if [ -f "${i}.4${gzext}" ]; then mv -f "${i}.4${gzext}" "${i}.5${gzext}"; fi
        if [ -f "${i}.3${gzext}" ]; then mv -f "${i}.3${gzext}" "${i}.4${gzext}"; fi
        if [ -f "${i}.2${gzext}" ]; then mv -f "${i}.2${gzext}" "${i}.3${gzext}"; fi
        if [ -f "${i}.1${gzext}" ]; then mv -f "${i}.1${gzext}" "${i}.2${gzext}"; fi
        if [ -f "${i}.0${gzext}" ]; then mv -f "${i}.0${gzext}" "${i}.1${gzext}"; fi
        if [ -f "${i}" ]; then
              touch "${i}.$$" && chmod 640 "${i}.$$" && chown root:admin "${i}.$$"
              mv -f "${i}" "${i}.0" && mv "${i}.$$" "${i}" && if [ -x /usr/bin/gzip ]; then
                gzip -9 "${i}.0"; fi
        fi
    fi
done
if [ -f /var/run/syslog.pid ]; then kill -HUP $(cat /var/run/syslog.pid | head -1); fi
echo ""

cp -f /var/log/edmonton.log.1.gz /var/log/archived/edmonton_log-`/bin/date +%Y-%m-%d`.gz

sudo rm -f /var/log/edmonton.log
sudo touch /var/log/edmonton.log
sudo chgrp -v admin /var/log/edmonton.log
sudo chmod -v go+w /var/log/edmonton.log


for i in toronto.log; do
    if [ -f "${i}" ]; then
        printf %s " ${i}"
        if [ -x /usr/bin/gzip ]; then gzext=".gz"; else gzext=""; fi
        if [ -f "${i}.6${gzext}" ]; then mv -f "${i}.6${gzext}" "${i}.7${gzext}"; fi
        if [ -f "${i}.5${gzext}" ]; then mv -f "${i}.5${gzext}" "${i}.6${gzext}"; fi
        if [ -f "${i}.4${gzext}" ]; then mv -f "${i}.4${gzext}" "${i}.5${gzext}"; fi
        if [ -f "${i}.3${gzext}" ]; then mv -f "${i}.3${gzext}" "${i}.4${gzext}"; fi
        if [ -f "${i}.2${gzext}" ]; then mv -f "${i}.2${gzext}" "${i}.3${gzext}"; fi
        if [ -f "${i}.1${gzext}" ]; then mv -f "${i}.1${gzext}" "${i}.2${gzext}"; fi
        if [ -f "${i}.0${gzext}" ]; then mv -f "${i}.0${gzext}" "${i}.1${gzext}"; fi
        if [ -f "${i}" ]; then
              touch "${i}.$$" && chmod 640 "${i}.$$" && chown root:admin "${i}.$$"
              mv -f "${i}" "${i}.0" && mv "${i}.$$" "${i}" && if [ -x /usr/bin/gzip ]; then
                gzip -9 "${i}.0"; fi
        fi
    fi
done
if [ -f /var/run/syslog.pid ]; then kill -HUP $(cat /var/run/syslog.pid | head -1); fi
echo ""

cp -f /var/log/toronto.log.1.gz /var/log/archived/toronto_log-`/bin/date +%Y-%m-%d`.gz

sudo rm -f /var/log/toronto.log
sudo touch /var/log/toronto.log
sudo chgrp -v admin /var/log/toronto.log
sudo chmod -v go+w /var/log/toronto.log

for i in montreal.log; do
    if [ -f "${i}" ]; then
        printf %s " ${i}"
        if [ -x /usr/bin/gzip ]; then gzext=".gz"; else gzext=""; fi
        if [ -f "${i}.6${gzext}" ]; then mv -f "${i}.6${gzext}" "${i}.7${gzext}"; fi
        if [ -f "${i}.5${gzext}" ]; then mv -f "${i}.5${gzext}" "${i}.6${gzext}"; fi
        if [ -f "${i}.4${gzext}" ]; then mv -f "${i}.4${gzext}" "${i}.5${gzext}"; fi
        if [ -f "${i}.3${gzext}" ]; then mv -f "${i}.3${gzext}" "${i}.4${gzext}"; fi
        if [ -f "${i}.2${gzext}" ]; then mv -f "${i}.2${gzext}" "${i}.3${gzext}"; fi
        if [ -f "${i}.1${gzext}" ]; then mv -f "${i}.1${gzext}" "${i}.2${gzext}"; fi
        if [ -f "${i}.0${gzext}" ]; then mv -f "${i}.0${gzext}" "${i}.1${gzext}"; fi
        if [ -f "${i}" ]; then
              touch "${i}.$$" && chmod 640 "${i}.$$" && chown root:admin "${i}.$$"
              mv -f "${i}" "${i}.0" && mv "${i}.$$" "${i}" && if [ -x /usr/bin/gzip ]; then
                gzip -9 "${i}.0"; fi
        fi
    fi
done
if [ -f /var/run/syslog.pid ]; then kill -HUP $(cat /var/run/syslog.pid | head -1); fi
echo ""

cp -f /var/log/montreal.log.1.gz /var/log/archived/montreal_log-`/bin/date +%Y-%m-%d`.gz

sudo rm -f /var/log/montreal.log
sudo touch /var/log/montreal.log
sudo chgrp -v admin /var/log/montreal.log
sudo chmod -v go+w /var/log/montreal.log


sudo launchctl load /System/Library/LaunchDaemons/com.apple.syslogd.plist

Then, I also added the following to /etc/syslog.conf

local4.*                        /var/log/montreal.log
local6.*                        /var/log/edmonton.log
local0.*                        /var/log/toronto.log

That's it!