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ps -eo %mem,user --sort=user | grep -v MEM | grep -v 68 | sed -e 's/  */:/g'

:0.5:apache
:0.4:apache
:0.0:bigik
:0.0:bigik
:0.0:dbus
:0.0:dovecot
:0.1:haldaemon
:0.0:haldaemon
:0.9:mysql
:1.5:nobody
:0.0:root
:0.0:root
...

Total Memory Used for apache: XX
Total Memory Used for bigik: XX
...

for line in `ps -eo %mem,user --sort=user | grep -v MEM | grep -v 68 | sed -e 's/  */:/g'`; do
        user=`echo $line|cut -d":" -f2`
        valeur=`echo $line|cut -d":" -f3`
        tab[$user]+=$valeur
done

awk

ps -eo %cpu,user |
LC_ALL=C awk '
        {
          { if ($2 != "USER") CPU_USER[$2]+=$1 }
        }
        END \
        {
        for (user in CPU_USER)
                {
                  _user=user
                  gsub(/[-.]/,"_", _user);
                  print _user".value", CPU_USER[user]
                }
        }'

#!/bin/bash

while read user perc
do user="${user/-/_}"
   [ "$user" = "$prevuser" ] || { prevuser="$user"; users+=( "$user" ); }
   eval "$user"=$(bc <<<"${!user:-0} + $perc" )
done < <(ps h -eo user:15,%cpu --sort=user)

for user in "${users[@]}"
do val=${!user}
   [[ "$val" =~ ^\.[0-9]* ]] && val=${val/./0.}
   echo "$user : $val"
done

#!/bin/bash4

declare -A CPU

while read user perc
do user="${user/-/_}"
   CPU[$user]=$(bc <<<"${CPU[$user]:-0} + $perc" )
done < <(ps h -eo user:15,%cpu --sort=user)

for user in "${!CPU[@]}"
do [[ "${CPU[$user]}" =~ ^\.[0-9]* ]] && CPU[$user]="${CPU[$user]/./0.}"
   printf '%15s : %s\n' "$user" "${CPU[$user]}"
done | sort