ESC Silicon Valley - San Jose, CA (April 26-29, 2010)

More info. & Register : http://bit.ly/esc4sj

ESC Silicon Valley - San Jose, CA (April 26-29, 2010)

Attend the next ESC which brings together system architects, design engineers, suppliers, analysts and media from across the globe. With 10,000 total attendees, it’s the largest and most prestigious annual engineering event in America. Participate in ESC, and you will meet with your customers, renew relationships, sell to pro...spects, attend press meetings, make announcements, and talk to partners – Only at ESC.

Keynote Speakers:

Dr. Michio Kaku
Theoretical Physicist, Bestselling Author and Science Popularizer

Richard Templeton
Chairman, President, Chief Executive Officer, Texas Instruments

Jason Wolf
Vice President, North America, Better Place

• Designing with Open-Source Software, including Linux and Android
• Developing for Windows Embedded
• Microprocessors/Microcontrollers/DSPs
• Networking and Connectivity
• Operating System Selections, Tips and Tricks

More info. & Register : http://bit.ly/esc4s

How to Search & Replace in 2GB Big Text File?

Problem Statement:

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I am trying to edit few lines in a file, but it is a very big file more than 2GB text file. Opening, editing and saving in vi editor takes a long time.

1. To search and replace a string 'STRING' in a big file.

2. To find few lines having string 'GROUPS' and remove them from the original file.I tried 'grep -v 'GROUPS' file > newfile', is there any better way than this.

Is this possible to do without opening a file through other ways not in Vi editor.

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Perl Solution

    perl  -e 's/gopher/World Wide Web/gi'  -p  -i.bak  *.html

This command, issued at the Unix prompt, executes the short Perl program specified in single quotes. This program consists of one Perl operation: it substitutes for original word "gopher" the phrase "World Wide Web" (globally, ignoring case). The command line options imply that the Perl program should run for each file ending in .html in the current directory. If any file blah.html needs changing, a backup of the original is made as file blah.html.bak.�

For more info on perl, please go through
http://www.cs.tut.fi/~jkorpela/perl/course.html#whatis

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sed solution:
for deleting GROUPS from all lines
use this :
sed -i '/GROUPS/d' file_name
OR
sed 's/old_string/new_string/g' oldfilename > newfilename

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Source: VLSICore Members