According to man ps, ps -aux is "To see every process on the system using standard (UNIX) syntax". I found no way to set a user-defined format to display the output.

In BSD syntax however, you can set the width of the column like: user:<width>. The following should give you the same information, setting the username column width to 20 (or any other value):

ps axo user:20,pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm

output with (very) long name:

USER                   PID %CPU %MEM    VSZ   RSS TT       STAT  STARTED     TIME COMMAND



.........................................................................................



root                  3826  0.0  0.1  77828  4788 ?        Ss   08:15:55 00:00:00 cupsd

lp                    3831  0.0  0.0  63156  2224 ?        S    08:15:56 00:00:00 dbus

lp                    3832  0.0  0.0  63156  2220 ?        S    08:15:56 00:00:00 dbus

root                  4822  1.7  5.1 446964 210416 tty8    Ss+  08:38:00 00:03:27 Xorg

root                  4923  0.0  0.1 174652  4412 ?        Sl   08:38:02 00:00:00 lightdm

tantemarievanhier     5181  0.0  0.1 544216  4796 ?        Sl   08:38:08 00:00:00 gnome-keyring-d

tantemarievanhier     5228  0.0  0.0  40492  2740 ?        Ss   08:38:08 00:00:00 init

tantemarievanhier     5369  0.0  0.0  41816  3064 ?        Ss   08:38:09 00:00:02 dbus-daemon

tantemarievanhier     5376  0.0  0.0  10616   316 ?        Ss   08:38:09 00:00:00 ssh-agent

setting column width to 7:

ps axo user:7,pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm



USER     PID  %CPU %MEM    VSZ   RSS TT       STAT  STARTED     TIME COMMAND



.........................................................................................



tantem+  6623  0.0  0.0 287228  3820 ?        Sl   08:39:00 00:00:00 unity-webapps-s

tantem+  6679  0.0  0.4 676856 18640 ?        Sl   08:39:20 00:00:00 update-notifier

tantem+  6721  0.0  0.1 541224  7056 ?        Sl   08:40:20 00:00:00 deja-dup-monito

tantem+  6743  0.0  0.5 810616 21888 ?        Sl   08:41:55 00:00:00 unity-scope-hom

tantem+  6758  0.0  0.2 717256 10352 ?        Sl   08:41:55 00:00:00 unity-files-dae

tantem+  6760  0.0  0.5 607208 22920 ?        Sl   08:41:55 00:00:00 unity-scope-loa

tantem+  6784  0.0  0.2 350676  9060 ?        Sl   08:41:56 00:00:00 unity-music-dae

For convenience reasons, you could add the following line to ~/.bashrc:

alias psaux='ps axo user:20,pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm'

so that ps aux is the "normal" output, while psaux gives you the full name- version.

Note:

You can also show the full name by moving the name column to the last position:

ps axo pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm,user

gives:

 PID %CPU %MEM    VSZ   RSS TT       STAT  STARTED     TIME COMMAND         USER





 5181  0.0  0.1 544216  4548 ?        Sl   08:38:08 00:00:00 gnome-keyring-d tantemarievanhier

 5228  0.0  0.0  40492  2668 ?        Ss   08:38:08 00:00:00 init            tantemarievanhier

 5369  0.0  0.0  41816  3032 ?        Ss   08:38:09 00:00:07 dbus-daemon     tantemarievanhier

How to display the output, setting the width of the USER column automatically

There is another, more refined way to set the width of the USER- column. If we run the command with a very high value for the USER column width, we can use a small script to rearrange the lines, adjusting the column width to the longest user name.

To do so

• Copy the script below, paste it into an empty file, save it as psaux_alternative.py.


• Make it executable



• Add a line to your ~/.bashrc:

  
  
  

  alias psaux='/path/to/psaux_alternative.py`
  
  

Then, running psaux in a terminal window will display the output with an automatic width of the USER column.

The script:

#!/usr/bin/env python3



import subprocess



command = "ps axo user:30,pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm"

l = subprocess.check_output(["/bin/bash", "-c", command]).decode("utf-8").split("

")

minlen = sorted(set([30-len(item.split(" ")[0]) for item in l]))[0]

for line in l:

    print(line[:30-minlen]+line[30:])