Quick bash script to generate checksums of a file passed as an argument

gensums.sh

#!/bin/bash

# generate checksums for files passed as arguments

# $'\r' included to provide windows line breaks :)

infile=$1
out=$infile.sums.txt

echo "" > $out
echo "MD5:" | tee -a $out && md5sum $infile | tee -a $out
echo $'\r' | tee -a $out
echo "SHA-1:" | tee -a $out && sha1sum $infile | tee -a $out
echo $'\r' | tee -a $out
echo "SHA-256:" | tee -a $out && sha256sum $infile | tee -a $out
echo "done."