sed -re 's/=([0-9A-F]{2})/\\u001/g' | while read L ; do echo -e $L ; done

recode CP1252/QP..UTF-8 < filein > fileout

find . -name "*.mbox" -exec file -i "{}" ";"
   | grep -v "(us-ascii|utf-8)$"
   | sed -e 's/^([^:]*): .*; charset=([^=]*)$/recode 2/QP..utf-8 < "1" > "1.tmp" && mv "1.tmp" "1"/g'
   > recode-script.sh