local utils = { }

function utils.run_or_kill(command)
    -- Check throught the clients if the class match the command
    local lower_command=string.lower(command)
    for k, c in pairs(client.get()) do
        local class=string.lower(c.class)
        if string.match(class, lower_command) then
            for i, v in ipairs(c:tags()) do
                c:kill()
                return
            end
        end
    end
    awful.util.spawn(command)
end

return utils