In some cases, you may want to know the number of processes working in the system. You can know it by grep -ef | grep <process name> | wc -l
Following is the example to check the total number of process for "postgres":
ps -ef | grep postgres | wc -l
Following is the example to check the total number of process for "ffmpeg":
ps -ef | grep ffmpeg | wc -l
If you want to check the processes with full path,
ps -aux | grep bot
Then, you will see:
root 17364 0.0 0.0 436760 19536 ? S 09:00 0:00 php /pub/production/_bot/bot_main.php root 17402 0.0 0.0 113284 1596 ? Ss 09:00 0:00 bash -c cd "/lib/production/_bot" && php import_db.php root 17933 0.0 0.0 436760 19532 ? S 09:05 0:00 php /pub/production/_bot/bot_main.php root 18038 0.0 0.0 113284 1596 ? Ss 09:05 0:00 bash -c cd "/lib/production/_bot" && php channels.php kurapa 21211 0.0 0.0 112816 972 pts/2 S+ 09:28 0:00 grep --color=auto bot
To count its list,
ps -aux | grep bot | wc -l