I need to find text in a file and replace it

[HughP]

• http://stackoverflow.com/questions/5171901/sed-command-find-and-replace-in-file-and-overwrite-file-doesnt-work-it-empties
• http://stackoverflow.com/questions/525592/find-and-replace-inside-a-text-file-from-a-bash-command
• http://askubuntu.com/questions/84007/find-and-replace-text-within-multiple-files
• http://www.cyberciti.biz/faq/unix-linux-replace-string-words-in-many-files/