Question

I’m made the following code to determine if a process is running:

#!/bin/bash
ps cax | grep 'Nginx' > /dev/null
if [ $? -eq 0 ]; then
  echo "Process is running."
else
  echo "Process is not running."
fi

I would like to use my code to check multiple processes and use a list as input (see below), but getting stuck in the foreach loop.

CHECK_PROCESS=nginx, mysql, etc

What is the correct way to use a foreach loop to check multiple processes?

Answer 1

Use a separated list of of processes:

#!/bin/bash
PROC="nginx mysql ..."
for p in $PROC
do
  ps cax | grep $p > /dev/null

  if [ $? -eq 0 ]; then
    echo "Process $p is running."
  else
    echo "Process $p is not running."
  fi

done

If you simply want to see if either one of them is running, then you don’t need loo. Just give the list to grep:

ps cax | grep -E "Nginx|mysql|etc" > /dev/null