Disable IPv6

echo "blacklist ipv6" >> /etc/modprobe.d/blacklist.conf
reboot

Enable UTF-8

On debian based systems, you can enable UTF-8 support by running

dpkg-reconfigure locales

Make sure to select the UTF-8 character set that you want to enable.

Recompile deb Package

Make sure a "source" source is defined in /etc/apt/sources.list. Something like this

deb-src http://http.us.debian.org/debian lenny main contrib non-free

Then, the basic steps are

Clear ColdFusion Cache

ColdFusion class cache files are located at

${COLDFUSION_ROOT}/wwwroot/WEB-INF/cfclasses

Stop cold fusion, delete the class files in this directory, and start cold fusion.

See Unencryped Passwords

more system:running-config

View Realtime Logs

To enable realtime logging to the current terminal connection

terminal monitor

And, to disable them

terminal no monitor

View CPU Usage

show processes cpu

Watch pings pass through

debug icmp trace

Disable debugging

Print all but the first column

awk '{$1="";$0=substr($0,2)}1'

• $1="" - empty the first field
• $0=substr($0,2) - start the whole line at the second position and ignore the space at the first position
• 1 - awk evaluates this as true and the default action is to print the line

Print all but the last column

awk '{$NF=""; NF--; print}'

Find the sum of the 5th column of numbers from stdin

Troubleshooting

Check how much memory each apache2 process is using

ps -ylC apache2 --sort:rss

Check the average apache2 process memory use

ps -ylC apache2 --sort:rss |\
   awk '{sum+=$8; ++n} END {print "Tot="sum"("n")="sum/1024" MB";print "Avg="sum"/"n"="sum/n/1024" MB"}'

Count the number of current HTTP connections by remote IP address

netstat -ant | grep :80\  | awk '{print $5}' | awk -F : '{$NF="";}1' | \
  sort | uniq -c | sort -n

Count the number of current HTTPS connections by remote IP address