zstd2xz

#!/bin/bash
## Created by Georgi Patsev
## https://github.com/BaiGeorgi/backup-scripts
## Please read GPLv3! https://www.gnu.org/licenses/gpl-3.0.html
display_usage() { 
	echo "Run the script with two parameters input.zst and output[the script will add xz extension]" 
	echo -e "Example:"
	echo -e "./zstd2xz backup.zst backup"
	echo -e "Will convert the archive with stdout and stdin."
	echo -e "\nArchives list:"
	ls *.zst
	ls *.xz
}
	if [  $# -le 1 ] # if less than two arguments supplied, display usage
	 then 
	 display_usage
	 exit 1
	fi
	if [[ ( $# == "--help") ||  $# == "-h" ]] # check whether user had supplied -h or --help . If yes display usage
	 then 
	 display_usage
	 exit 0
	fi
ZSTD="$1"
XZ="$2"
zstd -dc "$ZSTD" | xz -T0 -vv9e > "$XZ".img.xz ## You can see the input and the output size, drink some cofee and return later.