Linux

Security

Ubuntu Server Hardening

http://www.andrewault.net/2010/05/17/securing-an-ubuntu-server/
http://ubuntuforums.org/showthread.php?t=1002167

System Management

Install Kernel Headers

sudo apt-get install linux-headers-$(uname -r)

Remove all Kernel except the actual

sudo apt-get remove --purge $(dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d')

Get active CPU scheduler

cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

Want to kill every process accessing /data/sales on a Linux operating systems? Try:

fuser -k -15 -m /data/sales
OR
fuser -k -9 -m /data/sales

config file view

Remove comments & blank lines from a config file:

egrep -v "^#|^$" file