string - shell script find and replace in file -

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I have a post postmaster.log, in which I need to find the pattern and change the value that changes. 

  MaxValue = 3 # It can not be any value for 3   
  
  MaxValue = 0   
 There is a problem like  
  "MaxValueSet = 3" and "MaxValue is currently low"   
 Are there. I have only changed MaxValue = 3 to MaxValue = 0, I tried to use  
  sed -i 's / maxValue = 3 / MaxValue = 0 / g but it works only if If for any other value MaxValue = 3 it will not work.   
 
 
 You can also work lines on  sed :  
  sed -i '/ ^ ^ MaxValue = / S / = [[: number:]] [[: digit:]] * / = 0 /' / home / postmaster.lag  < / Pre>

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