How to find Sunrise & Sunset times in US?

To find sunrise and sunset times in US check this website.http://www.sunrisesunset.com/usa/ The website also displays twilight times. 

List of commands I frequently use in Oracle

Listed below commands I fequently use on Oracle in Linux OS environment.
(I will keep updating as I come across more)...
Oracle Commands:

• .How to find whether listener is running or not? 
• lsnrctl status
• to start listener 
• lsnrctl start
• to stop listener
• lsnrctl stop 
• to list services
• lsnrctl services
  
• To Configure Listener
• from command prompt type netca
• to start dbconsole (Enterprise Manager Console)
• emctl start dbconsole
• to stop dbconsole
• emctl stop dbconsole
• to access Enterprise Manager
• https://<service_name>:1158/
• for example if your service name is my.example.com then access url will be https://my.example.com:1158/
• How to start Oracle dB?
• sqlplus /nolog
• sql> connect / as sysdba
• startup
• How to shutdown Oracle dB?
• shutdown immediate
• How to lock a user account & of course to unlock?  
• SQL> ALTER USER <username>  ACCOUNT LOCK;
• SQL> ALTER USER <username> ACCOUNT UNLOCK;
• If you want to change the password while you unlock, use the following command: 
• SQL> ALTER  USER <username> IDENTIFIED BY <password> ACCOUNT UNLOCK;

How to make SQLDeveloper work on Linux

SQLDeveloper ver 1.1.is a Java Product, much like JDeveloper. Unfortunately it does not seem to update java path automatically.
After Installing JDK in linux, open the file sqldeveloper.conf (path: $ORACLE_HOME/opt/sqldeveloper/sqldeveloper/bin) and modify the parameter SetJavaHome to point to the actual path where jdk resides.
Ex: I had installed JDK in /usr/java directory. So my entry for SetJavaHome is /usr/java/jdk1.6.0_18

List of Commands I use frequently in Linux/Unix

Being a developer, I hardly ever use Unix/Linux. However,every now and then I need to do work on Linux. Instead of keep searching internet or bug my friendly colleagues, I think it is a better idea to list out Linux commands below. So here goes (I will keep updating as I come across more)...

• remove directory /files.
• rm -fr *.*
• f flag will force remove (and not interactively ask whether you need to remove or not)
• r flag will allows for recursively deleting all files and directories
• note: if there is a need to ask before deleting any file, then use i flag
• How to find ip address in Linux?
• ifconfig will print the ip address
• note: if the above command returns "not found", then, use /sbin/ifconfig
• How to find Disk Usage: Link to baobob: Linux Disk usage analysis and cleanup tools

• How to find out where "java" or any other file installed (its complete path)?
• the command whereis java will list the complete path
• How to execute .bash_profile after changes?
• . ./.bash_profile (there should be a space between the first dot and the second one)
• create alias for commands
• alias cls=`clear tput`
• How to count number of files in a directory?
• file . -type f wc -l
• How to display present working directory in the prompt?
• In bash shell, set PS1=`\w` (I also add a colon ":" and a greater than symbol ">" at the end like this: PS1=`\w :>` for further references goto everything.com
• Vi Commands
• How to display filename while working inside vi?
  Type Ctrl+G
• How to display line numbers?
  Press ':' and type set number
• How to display mode we are working on (APPEND or OPEN...)?
  Press ':' and type set showmode
My earlier post on using Unix Find Command