There are many way to do this but let's focus on the main two that I know:

Using ps and xargs

With grep:

ps -ef | grep '<pattern>' | grep -v grep | awk '{print $2}' | xargs -r kill -9

With awk:

ps -ef | awk '<pattern> && !/awk/ {print $2}' | xargs -r kill -9

These commands will kill all the process that match with the <pattern>

So your script will be like:

#!/bin/bash
ps -ef | grep 'gunicorn' | grep -v grep | awk '{print $2}' | xargs -r kill -9

[ $? -eq 0 ] && echo 'killed gunicorn'

Using ps and for

for pid in `ps ax | grep '<pattern>' | awk ' { print $1;}'`; do 
  kill -9 $pid
done

This also will kill all the process that match with the <pattern>

So your script will be like:

#!/bin/bash

for pid in `ps ax | grep 'gunicorn' | awk ' { print $1;}'`; do 
  kill -9 $pid
done

[ $? -eq 0 ] && echo 'killed gunicorn'

There are many way to do this but let's focus on the main two that I know:

Using ps and xargs

With grep:

ps -ef | grep '<pattern>' | grep -v grep | awk '{print $2}' | xargs -r kill -9

With awk:

ps -ef | awk '/<pattern>/ && !/awk/ {print $2}' | xargs -r kill -9

These commands will kill all the process that match with the <pattern>

So your script will be like:

#!/bin/bash
ps -ef | grep 'gunicorn' | grep -v grep | awk '{print $2}' | xargs -r kill -9

[ $? -eq 0 ] && echo 'killed gunicorn'

Or,

#!/bin/bash
ps -ef | awk '/gunicorn/ && !/awk/ {print $2}' | xargs -r kill -9

[ $? -eq 0 ] && echo 'killed gunicorn'

Using ps and for

for pid in `ps ax | grep '<pattern>' | awk ' { print $1;}'`; do 
  kill -9 $pid
done

This also will kill all the process that match with the <pattern>

So your script will be like:

#!/bin/bash

for pid in `ps ax | grep 'gunicorn' | awk ' { print $1;}'`; do 
  kill -9 $pid
done

[ $? -eq 0 ] && echo 'killed gunicorn'