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How to rename multiple files in Unix or Linux

Convert docx to doc in Mac OS X Snow Leopard or Leopard

HISTORY shell variable management in Unix/Linux

How to eject CD/DVD from your MacBook or iMac

Play Prince of Persia on Ubuntu Linux using DOSBox

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How to find the IP address of the email sender in Gmail, Yahoo mail, Hotmail, AOL, Outlook Express, etc

Updates in aruljohn.com

  1. Rename multiple files in Unix or Linux from the command prompt - new
  2. iPhone WebApp: Latitude/Longitude Conversion between Decimal and Degrees/Minutes/Seconds - Updated it, fixed a minor bug
  3. iPhone WebApp: Is the website/webpage up? - Checks if a website or web page is up and working
  4. Deals & Sales for July 4th weekend - new deals for Independence Day
  5. Find network key for Verizon FiOS WEP SSID - network key for FiOS
  6. Mac OS X:Convert .docx file to .doc in Mac OS X Snow Leopard or Leopard - new
  7. Shell Script:Read a colon delimited file /etc/passwd and display certain columns - new
  8. HISTORY shell variable management in Unix/Linux - new
  9. Perl:Sample script to select data from MySQL table using DBI module - new
  10. Facebook Popularity of websites - Share, Like and Comment statistics - new
  11. How to eject CD/DVD from your MacBook or iMac - updated
  12. What Web Server does that website run on? - updated this page
  13. How to play Prince of Persia (DOS version) on Ubuntu Linux - using DOSBox emulator
  14. Country Information Lookup - updated country database
  15. SSN Lookup Program - displays state where the SSN was issued
  16. Detect iPad in PHP, Perl, JavaScript, Nginx, Apache, Lighttpd - How to programmatically detect an iPad visitor from the user-agent in PHP, Perl or JavaScript and configure it at webserver level for Nginx, Apache and Lighttpd servers.
  17. Perl code - Converting Binary to Decimal and vice-versa - updated
  18. Cron quick reference and examples - real world examples
  19. Installing Ubuntu Linux in VirtualBox - a tutorial with screenshots
  20. How to use tar, gzip and bzip2 - quick reference commands - I use them frequently
  21. Unicode List - html for snowman, sunshine, umbrella ☃ ☀ ☂
  22. Merry Christmas - Bible verses
  23. Rotate a website - by any angle (upside down or clockwise/counter-clockwise)
  24. Use Google Talk on iPhone/iPod Touch with Google App hosted domain - adding new URLs
  25. Preview short URL before visiting the actual website - Works for all - tinyurl, bit.ly, tr.im, is.gd.
  26. Phone Card Coupons - Call India for 2.21 cents per minute or use my referral 149070 at stanacard.com
  27. (128)Network is unreachable: connect to listener on [::]:80 - fix this error in Apache
  28. MD5, SHA1, CRC32 Hash Generator - Convert text to md5, sha1, crc32 hash
  29. Rescue and backup your important files - from a corrupt Windows XP/Vista partition
  30. How to remove CTRL M characters - remove the annoying ^M characters in files
  31. Bible in one page - now includes the full Bible in one page, technically
  32. Install Ubuntu Linux on your Sony PSP - a tutorial
  33. Save as PDF - how to save documents or webpages as PDF