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Search and Replace using awk

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# 1  
Old 08-26-2009
Question Search and Replace using awk

Hi, I am really confused with this problem that I am facing .
I have a file that contains entries in the form :

option1 Value1
option2 Value2
option3 Value3
option4 Value4

I want to search for the keyword "option4" and replace "value4" by another value, say "value5".
My main problem is, i have no clue about the values, I just know the name of the "options" available. So, i have to search for the option and then somehow replace the corresponding value.
Is there any way using awk to do this?
# 2  
Old 08-26-2009
Can you show us what have you tried so far and where you are stuck?

# 3  
Old 08-26-2009
echo option4 Value4 | sed 's/option4.*/option4 <new value>/'

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