WhatsApp messages backup scripts

dryrun_wp_msg_bkp.sh

#!/usr/bin/env zsh

old="$1"
new="$2"
olddate=$(echo "$old" | sed -re "s/^.*?([0-9]{4}-[0-9]{2}-[0-9]{2})\.txt/\\1/g")
newdate=$(tail -1 "$new" | sed -re "s/^([0-9]*)\\/([0-9]*)\\/([0-9]*).*/20\\3-\\1-\\2/g" | sed -re "s/-([0-9])-/-0\\1-/g" | sed -re "s/-([0-9])$/-0\\1/g")

echo $old
echo $new
echo $olddate
echo ${3:-$newdate}

wp_msg_bkp.sh

#!/usr/bin/env zsh

old="$1"
new="$2"
olddate=$(echo "$old" | sed -re "s/^.*?([0-9]{4}-[0-9]{2}-[0-9]{2})\.txt/\\1/g")
newdate=$(tail -1 "$new" | sed -re "s/^([0-9]*)\\/([0-9]*)\\/([0-9]*).*/20\\3-\\1-\\2/g" | sed -re "s/-([0-9])-/-0\\1-/g" | sed -re "s/-([0-9])$/-0\\1/g")

cat "$old" "$new" >> "${old%%$olddate.txt}${3:-$newdate}.txt"
rm -rf "$old" "$new"