How can I measure the actual memory usage of an application or process?

Question

This question is covered here in great detail.

How do you measure the memory usage of an application or process in Linux?

From the blog articl

Answer 1

#!/bin/ksh
#
# Returns total memory used by process $1 in kb.
#
# See /proc/NNNN/smaps if you want to do something
# more interesting.
#

IFS=$'\n'

for line in $(