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Recursively touching directories last modified datetime as the same datetime of the last modified file inside

Maybe something like this:

find . -type d -print0 | while read -r -d '' dir; do file="$(find "$dir" -maxdepth 1 -type f  -printf '%T+ %p\n' | sort -r | head -1 | cut -d' ' -f2-)";if [ -n "$file" ]; then touch "$dir" -mr "$file"; fi; done

Explanation:

 

To pass modification date from one file to another we have to run:

 

touch file1 -mr file2

First we have to find subdirectories:

find . -type d -print0 | while read -r -d '' dir; do echo "$dir"; done

In this case -exec option would get too complex so I use while-read approach. You need to make sure to pipe the output from find with NUL as record separator, and tell read to split on that (-d '').

To find files with last modification date I can use:

find ./  -maxdepth 1 -type f  -printf '%T+ %p\n' | sort -r | head -1 | cut -d' ' -f2-

Combining it:

find . -mindepth 1  -type d -print0 | while read -r -d '' dir; do file="$(find "$dir" -maxdepth 1 -type f  -printf '%T+ %p\n' | sort -r | head -1 | cut -d' ' -f2-)";echo "$dir <- $file"; done

Finally, adding touch:

find . -mindepth 1  -type d -print0 | while read -r -d '' dir; do file="$(find "$dir" -maxdepth 1 -type f  -printf '%T+ %p\n' | sort -r | head -1 | cut -d' ' -f2-)";touch "$dir" -mr "$file"; done

I use -mindepth option here because I launched this command from directory containing dir_a which does not have any file to read date from. To eliminate this problem I can use if-else to ensure i do not try to read time from non existing file:

find . -type d -print0 | while read -r -d '' dir; do file="$(find "$dir" -maxdepth 1 -type f  -printf '%T+ %p\n' | sort -r | head -1 | cut -d' ' -f2-)";if [ -n "$file" ]; then touch "$dir" -mr "$file"; fi; done
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