#!/bin/bash
FILE="$1"

if [ -f "./checksums.txt" ]; then
truncate ./checksums.txt
else
touch ./checksums.txt
fi

echo $FILE >> ./checksums.txt
echo '' >> ./checksums.txt

echo 'SHA1' >> ./checksums.txt && sha1sum "$FILE" | awk '{print $1}' >> ./checksums.txt
echo '' >> ./checksums.txt
echo 'MD5' >> ./checksums.txt && md5sum "$FILE" | awk '{print $1}' >> ./checksums.txt
echo '' >> ./checksums.txt
echo 'SHA256' >> ./checksums.txt && sha256sum "$FILE" | awk '{print $1}' >> ./checksums.txt