bash - sed command to add text for only last line in unix -

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I think the sed command will only add a comma to the last line. Example I have a text file with 

  "87270 9" "872808" "872808b" "8729029 921" "879b" "87290" "Airhome 9" "22" "DDSP 2222" "G929"   
 Add a comma on the last line  
  "87270 9" "872700" "145" "872808b" "8729029 921" "879b" "87290" "Airho 9" "at 22" "DVDSPP22" "G992",    
 
 
 You can use  sed  Are:  
  sed '$ s / $ /, /' file "872709" "872700" "145" "872808b" "8729029 921" "879b" "87290" "Aeroho 9 "" at 22 "" DVDSPP22 "" G992 ",   
 To save changes to inline use:  
  sed -i .bak '$ s / $ /, /' file

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