Linux - Sum using awk
$ ls -lh php*; ls -l php* | awk '{ SUM += $5} END { print SUM/1024/1024 }'
-rw-rw-r-- 1 admin site13 1013 Aug 12 11:01 php_checkbox_check.php
-rw-rw-r-- 1 admin site13 8.9k Nov 11 23:15 php_contact_form.php
-rw-rw-r-- 1 liamdela site13 560 Oct 1 2002 php_convert_url_to_link.php
-rw-r--r-- 1 root site13 948 Dec 7 21:56 php_gethostbyaddr.php
-rw-rw-r-- 1 liamdela site13 2.1k Feb 25 2002 php_list_a_directory.php
-rw-rw-r-- 1 liamdela site13 1.7k May 28 2003 php_multi_dimensional_arrays.php
-rw-rw-r-- 1 admin site13 2.9k Nov 14 13:15 php_prev_next_array.php
-rw-r--r-- 1 admin site13 1.9k Feb 3 00:55 php_uk_mailing_list.php
0.0194302