function shcmd (cmd)

    if not cmd or cmd == "" then return nil, "No command" end

    local fullcmd = cmd.." 2> /dev/null"

    local fh = io.popen(fullcmd)

    result = fh:read("*a")  -- read cmd output

    fh:close()

    -- Trim trailing newlines

    local r = result:gsub("\n+$", "")

    return r

end