Moving files and renaming using a portion of directory structure and a portion of current filename

Question

So here's current path:

../CAMERA3/serialnum/2016-12-19/001/dav/07/07.02.53-07.03.14[M][0@0][0].dav

here end goal:

../CAMERA3/2016-12-19_07.02.53-07.03.14.dav

So I'm basically trying to figure out a for loop that pulls some of the directory names and portion of filename like so:

mv ../$dir1/$dir2/$dir3/$dir4/$dir5/$dir6/$filenameportion[M][0@0][0].dav ../$dir1/$dir3_$filenameportion.dav

Answer 1

Ended up having to use rnm. Kind of ugly but it works:

find /mnt/test -name '*.dav' -exec sh -c 'for filename do 
    if [[ $(basename "$filename") != C*.dav ]];then
        find "$filename" -type f -execdir ~/bin/rnm -y "$filename" -ns '/pd05/_/pd03/_/n/.dav' \;
    fi
done' find-sh {} \;

find /mnt/test -name '*.dav' -exec sh -c 'for filename do 
    rename "[M][0@0][0]" "" "$filename" 
done' find-sh {} \;

find /mnt/test -name '*.dav' -type f -execdir sh -c 'mv "$@" ./../../../../..' find-sh {} \;

PS: Yes I'm both users. I originally posted as guest and then followed the email link to create an account. Surprised it wasn't automatic. Sorry about backslashes confusion, copied files to windows laptop, forgot to change back for post.

Update 1: removed looping over finds output

Answer 2

Improving Pauls' answer:

The following code:

find /mnt/test -name '*.dav' -exec sh -c 'for filename do 
    if [[ $(basename "$filename") != C*.dav ]];then
        find "$filename" -type f -execdir ~/bin/rnm -y "$filename" -ns '/pd05/_/pd03/_/n/.dav' \;
    fi
done' find-sh {} \;

Can be optimized like this (without any find or for loop):

rnm -y -ns '/pd5/_/pd3/_/n/.dav' -ss '^[^C].*\.dav$' -fo -dp -1 /mnt/test

Explanation:

-ss: Search string (regex). The regex used above searches for files that end with .dav and do not start with C.

-fo: File only mode.

-dp: Depth. -1 means unlimited depth i.e go to all subdirectories.

-ns: Name string (new name)

/pd<digit>/: A name string rule that implies different levels of parent directory names: 0 is the immediate parent, 1 is above that and so forth.

/n/: Another name string rule that implies file name without extension. /n/.dav could be replaced with /fn/ (full name).

-y: Confirm (--yes) for all.