How to check if a process is running in bash with a pid file?

Question

bash

Am I correct to check if the process is running?

PID=`cat $PIDFILE`
if 
then

Whole daemon code: parity.sh

Answer 1

Usually they also check whether this is the process that interests you - so as not to nail something else inadvertently.

Answer 2

everything is fine, just remove the logical AND -a