How to let 'kill' ignore processes that are not alive

Question

How to tell the kill command to ignore processes if that process is not alive?

For example: 3453 is an alive process but 44534 is not.

kill -9 3453 44534

Answer 1

for pid in 3453 44534
do
  kill -9 "$pid" > /dev/null 2> /dev/null || :
done

Answer 2

kill -9 3453 || kill -9 44535

Answer 3

taskid=12345

if ps ax | grep -v grep | grep $taskid > /dev/null; then
  kill -9 $taskid
  # Task killed
fi

Answer 4

Most people are not aware that kill is a built-in command for many shells and I am assuming that you are using bash and that you would like to suppress the "no such process" messages that may be generated. The executable located in /bin/kill on one of my machines generates no such messages.

$ /bin/kill -9 3453 44534