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9.6 Classifying Files

If you want to classify a set of files into several groups based on different criteria, you can use the comma operator to perform multiple independent tests on the files. Here is an example:

     find / -type d \( -perm -o=w -fprint allwrite , \
       -perm -o=x -fprint allexec \)
     echo "Directories that can be written to by everyone:"
     cat allwrite
     echo ""
     echo "Directories with search permissions for everyone:"
     cat allexec

find has only to make one scan through the directory tree (which is one of the most time consuming parts of its work).