find /path | xargs  <command set goes here>
#example
find /path -type f | xargs mv "{}" "{}"".old"

find /path -type -f  -name '*.sh' | \
while read file
do
     echo "$file"  # the code you have makes no sense to me, so change this line
     # maybe you want to add 2001 to the file name, I cannot tell.
     # you are sed-ing 2001 for some reason.
     mv "$file" "$file".2001
done