Должно работать на любом терминале поддерживающем VT Escape 
последовательности, проверено в Linux, True64 ,  HP-UX  и Соларисе .

#!/bin/ksh
SLEEP=$1
FIELD=$2
[ -z "$1" ] && SLEEP=10 
[ -z "$2" ] && FIELD=1
stty_save=`stty -g`
trap "stty $stty_save ; exit; " 2 
stty sane
clear
lines=`tput lines`
lines=$((lines-5))
DATE=`date '+%H:%M:%S'`
echo "\t\t`tput rev``hostname` TOP $lines PROCESESS at $DATE every $SLEEP seconds`tput sgr0`"
tput bold
case `uname` in
        Linux)  PS_COMMAND="ps -e -o pcpu= -o cputime= -o user= -o uid= -o pid= -o pmem= -o rssize= -o comm="
                HEADER_COMMAND="ps f  -p $$ -o pcpu,cputime,user,uid,pid,pmem,rssize,command"
                ;;
        HP-UX)  UNIX95=1
                export UNIX95
                PS_COMMAND="ps -e -o pcpu= -o time= -o user= -o uid= -o pid= -o vsz= -o sz= -o comm="
                HEADER_COMMAND="ps -p $$ -o pcpu,time,user,uid,pid,vsz,sz,comm"
                ;;
        SunOS)  HEADER_COMMAND="ps -f -p $$ -o pcpu,time,user,uid,pid,pmem,rss,comm"
                PS_COMMAND="ps -e -o pcpu= -o time= -o user= -o uid= -o pid= -o pmem= -o rss= -o comm="
                ;;

        *)      PS_COMMAND="ps -ef -o pcpu=,cputime=,user=,uid=,pid=,pmem=,rssize=,comm="
                HEADER_COMMAND="ps -f -p $$ -o pcpu,cputime,user,uid,pid,pmem,rssize,command"
                ;;
esac
$HEADER_COMMAND | head -1
tput sgr0
while [ true ] ; do 
        tput cup 2 0
        tput ed
        $PS_COMMAND | sort -r -n -k"$FIELD"  | head -$lines 
        sleep $SLEEP
done