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In the below shell script I have list of process ID's which need to be killed. When killing a process I am getting kill: 1234567: no such process error even after checking if the process id existence using ps -p. Can somebody explain what could be the reason

for pid in ${pids[@]}; do
     if ps -p $pid > /dev/null; then
         kill -9 $pid
     fi     
done

In the below shell script I have list of process IDs which need to be killed. When killing a process I am getting kill: 1234567: no such process error even after checking if the process id existence using ps -p. What could be the reason?

for pid in ${pids[@]}; do
     if ps -p $pid > /dev/null; then
         kill -9 $pid
     fi     
done