A short little script I stumbled across when cleaning my $HOME. I do not think I wrote it myself - at least I can't recall that I did. Quite handy and it's small and compact using the commands ps, awk, sort and head:

 

ps aux --no-headers | awk '
{
name[$1] += $1; 
pros[$1] += $4;
mem[$1] += $5 
}
END { 
for (var in name) { 
print mem[var]" "var" "pros[var] 
}
}' | sort -nr | head

 

The result is a top ten list of the users that consume the most memory:

 

741012 root 9.3
238152 bjorn 3.8
119380 thomasez 1.2
105332 krav 1.9
100804 lars 0.6
95916 ingvar 1.6
89720 kjetilho 1.5
78044 jo 1
74232 espen 0.8
73460 michael 0.4

 

There I am - at number five...