function sshkey --description "generate a SSH key"
    if test (count $argv) -ne 1
        echo "Usage: sshkey <file>"
        echo "example: sshkey ~/.ssh/your_key_name"
        return 1
    end

    set file $argv[1]

    if test -e "$file"
        echo "Error: $file already exists."
        return 1
    end

    ssh-keygen -t ed25519 -f "$file" -C "$(hostname)" -N ""
end