kiss: Use $pid instead of $$

kiss

@@ -293,7 +293,7 @@ pkg_extract() {
 
                     # Move the directory to prevent naming conflicts between
                     # the child and parent
-                    mv -f "$dir" "$$-$dir"
+                    mv -f "$dir" "$pid-$dir"
 
                     # First attempt to move all files up a directory level,
                     # if any files/directories fail (due to mv's lack of
@@ -307,17 +307,17 @@ pkg_extract() {
                     # Using only '$@' causes a single file from each
                     # invocation to be left out of the list. Weird, right?
                     {
-                        find "$$-$dir/." ! -name . -prune \
+                        find "$pid-$dir/." ! -name . -prune \
                             -exec sh -c 'mv -f "$0" "$@" .' {} + ||
 
-                        find "$$-$dir/." ! -name . -prune \
+                        find "$pid-$dir/." ! -name . -prune \
                             -exec sh -c 'cp -fRp "$0" "$@" .' {} +
                     } 2>/dev/null
 
                     # Remove the directory now that all files have been
                     # transferred out of it. This can't be a simple 'rmdir'
                     # as we may leave files in here due to above.
-                    rm -rf "$$-$dir"
+                    rm -rf "$pid-$dir"
                 done
 
                 # Clean up after ourselves and remove the temporary tar