Bash delete directories containing certain files

Given a directory structure like

parent
  - child1
    - file1
    - file2
    - file3
  - child2
    - file1
    - file3
  - child3
    - file1
    - file2
    - file3
    - file4

what command will delete all child directories of parent that contain all or some of file1, file2, file3 but no others. I.e. in the example child1 and child2 should be deleted but child3 should remain since it also contains file4.

Please post both a dry run and actual version of the command to first check which folders would be deleted.

Solution

You would probably need a function that deletes the child directories only if it does not contain a set of input file(s) you want to check for.

#!/bin/bash
delete_dir() {
    local subdir=$1
    local string_of_files=$2

    #convert list of files into array
    IFS=','
    read -ra files_to_keep <<< "$string_of_files"

    local list_of_files=()
    if [ -d "$subdir" ]; then
        for i in $subdir/*; do list_of_files=("${list_of_files[@]}" $(basename $i)); done

        local list_of_matched_files=()
        for i in ${list_of_files[@]}; do
            if [[ " ${files_to_keep[@]} " =~ " $i " ]]; then
               list_of_matched_files=("${list_of_matched_files[@]}" "$i")
            fi
        done

        if [ "${#list_of_matched_files[@]}" -eq 0 ]; then
            echo "deleting $subdir"
            #rm -r $subdir
        else
            echo "Not deleting $subdir, since it contains files you want to keep!!"
        fi
    else
        echo "directory $subdir not found"
    fi
    }

# Example1: function call
delete_dir child1 file4

# Example2: For your case you can loop through subdirectories like,
for dir in $(ls -d parent/child*); do
    delete_dir $dir file4
done

example output:

$ ./test.sh
Not deleting child1/, since it contains files you want to keep!!
Not deleting child2/, since it contains files you want to keep!!
deleting child3/

You'd be better off using python for such operations if you're are at liberty to choose, since you can make it much simpler and modular.