How to detect that less than x processes are running

Question

I need to write a shell script to see if the ADM Process is down we need to get an alert via email. I have done that using the script below. It is working fine if we have installed one ADM server on one machine. My issue is that I have installed 3 ADM servers on one machine and I am not sure how I can write the shell script to trigger an alert in this situation.

script:-

export ADM =`ps -ef  | grep Adm | grep -v grep | wc -l`

if [ $ADM == 0 ];
then
    echo "AdmServer is down on Dev $hostname" | mail -s xxxx.gmail.com
fi

Whenever Adm1 or Adm2 or Adm3 is down we need to get an alert.

Answer 1

Your script currently counts the number of ADM processes it can find and currently sends an email if the count is zero.

Your new criteria, is that the count should be 3, so if the count is 0 or 1 or 2 you want to send an email.

You need to change line 3

if [ $ADM -lt 3 ];

Answer 2

[ 3 -gt "$(ps -Aocomm=|grep -c ADM)" ] &&
mail -s xxxx.gmail.com <<MAIL
AdmServer is down on Dev $hostname
MAIL

I think the above command should work as a substitute for yours.