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shell script to replace a line contain an unkown pattern starting with "aaa, bbb"

 
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# 1  
Old 10-06-2008
shell script to replace a line contain an unkown pattern starting with "aaa, bbb"
Hello, can any one help me on this?

I have a /etc/exports file, it may contain a line (I can not remember exactly). Let me use an a sample file myfile.txt which contains a line
* mypattern uncertain key words

I want this line (with any possible combination of the uncertain key words to be replaced by the line below:

* mypattern root

I read some post on this forum about using sed to replace known patternA to a known patterB in file. Here since I do not know the 'uncertain key words' so I am stumble here. Please help.

Thanks in advance

--Dingrong
# 2  
Old 10-07-2008

Code:
sed 's/* mypattern .*/* mypattern root/' /etc/exports > tempfile

# 3  
Old 10-07-2008
MySQL Big thanks to cfajohnson
It worked. Many thanks sir.
--Dingrong
 
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