find out disk space usage

#!/bin/sh df -H | grep -vE '^Filesystem|tmpfs|cdrom' | awk '{ print $5 " " $1 }' | while read output; do   echo $output   usep=$(echo $output | awk '{ print $1}' | cut -d'%' -f1  )   partition=$(echo $output | awk '{ print $2 }' )   if [ $usep -ge 90 ]; then     echo "Running out of space \"$partition ($usep%)\" on $(hostname) as on $(date)" |      mail -s "Alert: Almost out of disk space $usep%" you@somewhere.com   fi done 

MySql show table status

information retrieval search

http://people.ischool.berkeley.edu/~hearst/irbook/
http://www.stanford.edu/class/cs240/readings/dean.pdf

skip DTD validation

http://stackoverflow.com/questions/243728/how-to-disable-dtd-at-runtime-in-javas-xpath

DAO

http://www.ibm.com/developerworks/library/j-dao/

http://java.sun.com/blueprints/patterns/DAO.html

java tip

http://www.javaspecialists.eu/archive/Issue142.html

http://www.1001javatips.com/

javascript template

http://code.google.com/p/trimpath/wiki/JavaScriptTemplates

TrimPath

keytool keystore

(Java 6 allows user to import private key and cert now)

http://cunning.sharp.fm/2008/06/importing_private_keys_into_a.html

(For older library, you may need the keyimport program)

http://www.nealgroothuis.name/import-a-private-key-into-a-java-keystore/

ssl certificate openssl

http://www.noah.org/wiki/CSR_Apache