About: http://webisa.webdatacommons.org/325327500

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Your best bet is a perl or python script which will be just a few lines but will be much more robust and faster to write than any shell/grep/sed/awk one might be able to get to work.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com