Replace whole line when match found with sed

Question

I need to replace the whole line with sed if it matches a pattern. For example if the line is \'one two six three four\' and if \'six\' is there, then the whole

Answer 1

Above answers worked fine for me, just mentioning an alternate way

Match single pattern and replace with a new one:

sed -i '/six/c fault' file

Match multiple pattern and replace with a new one(concatenating commands):

sed -i -e '/one/c fault' -e '/six/c fault' file