How to delete lines (not) containing specific string

How to delete lines (not) containing specific string

Remove lines not containing 2016-10-30
 sed -i.bak '/2016-10-30/!d' ./log.txt

 Remove lines  containing 2016-10-30
  sed -i.bak '/2016-10-30/d' ./log.txt


option -i.bak will create backup file.


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