awk sed grep tr (notes)

awk '{print $4}' /path/to/file | grep string | sed -e 's/part_of_string_to_remove//g'

awk '{print $4}' /path/to/file | grep string | tr -d 'part_of_string_to_remove'
awk '{print $4}' /path/to/squid/access_log | grep cloudfront | sed -e 's/\:443\"//g'

awk '{print $4}' /path/to/squid/access_log | grep cloudfront | tr -d ':443"'

$4 = 4th colum

cloudfront = string to search

:443″ = part of string to omit before output