Wget script to download a bunch of pics from subpages all linked from a single page

download_links.sh

 wget -qO- http://site_in_question.html | ack -o "pattern_of_subpages\.html" | xargs -I{} bash -c 'wget -qO- "http://subpage_prefix/"{} |  ack -o "(?<=src\=\").*?image_direct_link_pattern\.jpg" | (read img_link; wget "image_direct_link_subpattern/$img_link")'
 
 # Broken down:
 # wget -qO- http://site_in_question.html # wget site in question, redirects to stdout
 # ack -o "pattern_of_subpages\.html" # searches stdin for list of links to subpages
 # xargs -I{} bash -c # runs the following on each of those subpages
 # wget -qO- "http://subpage_prefix/"{} # wget each subpage with {} filling in the pattern identified by ack
 # ack -o "(?<=src\=\").*?image_direct_link_pattern\.jpg # searches the subpage for the direct link to the image
 # (read img_link; wget "image_direct_link_subpattern/$img_link") # assigns the image pattern to a variable and wgets it