bash - How to delete all the lines after the last occurence of pattern?

Question

i want to delete all the lines after the last occurence of pattern except the pattern itself

file.txt

honor
apple
redmi
nokia
apple
samsung
lg
htc

file.txt what i want

honor
apple
redmi
nokia
apple

what i have tried

sed -i '/apple/q' file.txt

this deletes all the line after the first occurence of pattern -

honor

Answer 1

Simple, robust 2-pass approach using almost no memory:

$ awk 'NR==FNR{if (/apple/) hit=NR; next} {print} FNR==hit{exit}' file file
honor
apple
redmi
nokia
apple

If that doesn't execute fast enough THEN it's time to try some alternatives to see if any produce a performance improvement.