process Count of each user in ps aux command

Question

How can i create a script to count process run by each user in ps aux. I used this

ps aux  | awk '{print $1}' | grep root | wc -l

but it lists count of root user only . I want to list number of process for each user. I need something like this:

root    20
jamshi  15 

Answer 1

ps -fo user | sort | uniq -c is worth a try.

The command ps -eo user=|sort|uniq -c will list process counts by user.

ps -eo user=|sort|uniq -c
      2 avahi
      1 kernoops
      1 messagebus
      1 nobody
    231 root
      1 statd
      5 steve
      1 syslog

If flipping the column order to read is required, pipe it through awk '{ print $2 " " $1 }'

Answer 2

You can try

ps aux |
awk 'NR>1{tot[$1]++;}
     END{for(id in tot)printf "%s %s\n",id,tot[id]}'