issue process list to show top cpu and ram usage

show_cpu_and_memory_usage.sh

#!/bin/bash

# ... issue process list to show top cpu and ram usage 
#     usage :
#
#     show_cpu_and_memory_usage.sh   >>  /file/holding/usage.log

SLEEP_PERIOD=5

output_header=$( ps aux|head -1 )

while true; do

	curr_snapshot=$( ps aux | sort -nrk 3,3 | cut -c1-155 | head -n 20 )

	echo
	date '+%Y%m%d_%H%M%S'
	echo
	echo "$output_header"
	echo "$curr_snapshot"

	sleep $SLEEP_PERIOD
done