Let the shell show you unsuccessfull exit instead.
BASH ON MAC GET TIME IN MILLISECONDS CODE
You can obtain last command's exit code via echo $?, but typing all that is a damn long thing. Remember that zero exit code means a command exited successfully, non-zero - command exited unsuccessfully. Shell prompt can show the exit code of the last command. For that purpose your shell prompt should contain a hostname, or even better - indicate an ssh connection. If you connect to servers using ssh, you need to distinguish your local and remote shells. And you will never take over root shell as regular.
The solution is to use color: red shell prompt for root and green for regular user. The particular user name is often not important, but it's status (regular or root) is. If you sometimes switch to root account, you need a "current user" indication. Keep in mind some really important things and don't waste your time for pwd command. If current working directory is not displayed, you have to keep it in mind and periodically check it with pwd command. Shell prompt should display a current working directory of a shell. Do not agree? Try to count how many commands were executed in this terminal: Please, put some useful information there, let it help you navigate! Make it handy especially if you see it every day! You can perceive it as a dashbord of a vehicle. It should be configured for your kind of work. Shell prompt is a small piece of text shown in the terminal at the beginning of your command line. Thats all, just keep working like nothing happened. The only thing left is to change your default shell and relogin. I recommend to take config used in Arch Linux: $ wget -O ~/.zshrc
BASH ON MAC GET TIME IN MILLISECONDS INSTALL
Just install it via package manager and find a pretty config. Starting to use Zsh is not difficult at all. I hope Zsh will once become a default shell in Ubuntu. Arch Linux has already migrated to Zsh in it's installation CD. You should install Zsh for at least three features: advanced autocompletition, typo correction and multiple pathname completition: when a single Tab converts /u/s/d into /usr/share/doc. So, if you often use a terminal, but grab a mouse for launching it, try to configure a handy hotkey. Of course, the thing is not a millisecond speedup, but that you open a terminal at the level of reflexes, completely oblivious to that. You know what? Now I don't think that Ctrl+Alt+T is fast enough. When I've migrated from Openbox to i3, I began to launch a terminal via Win+Enter, that binding worked out of the box. How much time you spend to launch a terminal? And another one? For a long time I've used Ctrl+Alt+T shortcut to launch a terminal and I thought it is fast. Instead of that, I will tell you what to do when you have already learned the hotkeys and know about sudo !!. Most of them discribe the trivials like "learn the hotkeys" or " sudo !! will run previous command with sudo". There are a lot of command line tips and trics in the internet.
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