bin/b: fix sudo prompt for paths with spaces

.local/bin/scripts/b

@@ -7,8 +7,10 @@ set -eo pipefail
 for last; do true; done
 last=${last:-.}
 
-# Elevate permissions if the file exists but is not accessible
-test -x "$(dirname $last)" && { test -r "$last" || ! test -e "$last"; } || elevate=sudo
+# Elevate permissions if the file is not accessible
+test -x "$(dirname "$last")" &&
+  { test -r "$last" || ! test -e "$last"; } ||
+    elevate=sudo
 tput setaf 4 && $elevate file -E "$last" | ( grep -v --color=never 'directory$' || true )
 
 case "$($elevate file --dereference --mime "$last")" in