bash script to verify sha checksum in a one-liner

I think one of the most important things you can do from a security perspective is to make safe choices easy/easier. One thing that I feel is too impractical is verifying sha checksums when the checksum is just listed on a webpage with no download option. Eg:

I wanted to make it a bit easier for myself and created a small, newbie bash script to perform the testing.

function verifyChecksum()
{
    while getopts "f:s:b:" opt; do
        case $opt in
            f) file="$OPTARG"
            ;;
            s) sum="$OPTARG"
            ;;
            b) bits="$OPTARG"
            ;;
        esac
    done

    echo "$sum $file" | sha"$bits"sum --check
}
So first of all, I create a function which I load with my other bash settings, so I don't have to run a file to get this working

Next I get some arguments, file (f), checksum (s) and bits (b)

I assign them to reasonable variable names before i perform the magic

Echo out the checksum followed by the file name, then perform a shaXsum where X is the bits specified as input.

Next time I open a terminal I can type something like this:

$ verifyChecksum -f Downloads/icaclient_20.04.0.21_amd64.deb -s 155BA05F03D555E286D99E64DC70260436E426A4BEADB0F829327CC6B5851B80 -b 256

And I'll (hopefully) get this as an output:

Downloads/icaclient_20.04.0.21_amd64.deb: OK

agur.dev

bash script to verify sha checksum in a one-liner