stats convert

$ cat stats
#!/bin/bash
# init

shopt -s extglob
scriptname="$(realpath $0)"

function editscript(){
echo "scriptname: $scriptname"
if [[ "$1" == "edit" ]]; then
 (/usr/bin/nano "$scriptname")
 exit
fi
}

function pause(){
   read -p "$*"
}

editscript "$1"

startd="${PWD}"; for i in */; do cd "$i"; for d in */; do cd "$d"; opus.book.4; cd -; done; cd "$startd"; done
startext="mp3"
elapsed="$SECONDS"
elmin="$((elapsed/60))"
elsec="$((elapsed-elmin*60))"
printf 'Script runtime: %ss / %s:%s mm:ss\n' "$SECONDS" "$elmin" "$elsec"

#printf 'Elapsed time: %s m:%s s\n' "$elmin" "$elsec"
#startsize="$(\du -bcs *@(flac|mp3|wav|m4?|ogg) |tail -1)"
startsize="$(find . -name "*mp3" -print0 | xargs -0 du -scb|tail -1)"
startsize="${startsize%$'\t'*}"
#startsizehr="$(\du -hcs *@(flac|mp3|wav|m4?|ogg) |tail -1)"
startsizehr="$(find . -iname "*@(flac|mp3|wav|m4?|ogg|aax)" -print0 | xargs -0 du -sch|tail -1)"
startsizehr="${startsizehr%$'\t'*}"
#opussize="$(\du -bcs *opus|tail -1)"
opussize="$(find . -name "*.opus" -print0 | xargs -0 du -scb|tail -1)"
opussize="${opussize%$'\t'*}"
#opussizehr="$(\du -hcs *opus|tail -1)"
opussizehr="$(find . -name "*.opus" -print0 | xargs -0 du -sch|tail -1)"
opussizehr="${opussizehr%$'\t'*}"
d=$((startsize-opussize))
r="$((d*100 / startsize))"
printf 'Initial size (%s) = %s bytes/ %s\n' "$startext" "$startsize" "$startsizehr"
printf 'Final size (opus) = %s bytes / %s\n' "$opussize" "$opussizehr"
printf '%s%% file size reduction\n' "$r"