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Sed and replacing one occurence of pattern

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# 1  
Old 07-16-2008
Sed and replacing one occurence of pattern
I would like to use sed to replace one occurence of a pattern in a file. When I use the s/// command it replaces all occurences of the pattern in the file. Should I be using something other than sed?
Thanks
# 2  
Old 07-16-2008
One possibility with awk:

Code:
awk '/ReplaceWhat/ && !f{sub("ReplaceWhat", "ReplaceWith");f=1}{print}' file

Regards
# 3  
Old 07-16-2008
Question Show data
Are you interested in the first or a particular instance of that pattern. Show an example of the input and output data.
# 4  
Old 07-16-2008
I am interested in the first instance of the pattern.
example : I want to replace "90 rotate" with "270 rotate"
# 5  
Old 07-16-2008
Have you tried my solution?

Code:
awk '/90 rotate/ && !f{sub("90 rotate", "270 rotate");f=1}{print}' file

# 6  
Old 07-16-2008
how do the quotes work if I want to put it in a system() command?
# 7  
Old 07-16-2008
I got it to work thanks
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