fi
# Show me all the .c files for which there doesn't exist a .o file.
- $ c=(*.c) o=(*.o(N)) eval 'ls ${${c:#(${~${(j:|:)${o:r}}}).c}:?done}'
+ $ print *.c(e_'[[ ! -e $REPLY:r.o ]]'_)
# All files in /var/ that are not owned by root
$ ls -ld /var/*(^u:root)