SHA256 Checksum

checksha256.sh

#!/usr/bin/env bash
set -euo pipefail

expected="${1:?usage: $0 <expected_sha256> <file>}"
file="${2:?usage: $0 <expected_sha256> <file>}"

actual="$(sha256sum -- "$file" | awk '{print $1}')"

if [[ "${actual,,}" == "${expected,,}" ]]; then
        echo "OK: SHA256 Match"
        exit 0
else
        echo "FAIL: SHA256 Does Not Match"
        echo "expected: $expected"
        echo "actual:   $actual"
        exit 1
fi