How can I run a command from the terminal without blocking it?

I run a lot of programs in Ubuntu from the terminal, but I would like to be able to continue using the terminal after I have a program open. How can I put the programs in the background so that I don't have to open another window?

Salvador Dali

Posted 2012-12-02T01:22:56.560

Reputation: 897

Answers

There are different ways to run a terminal program and continue using the terminal:

You can open another terminal tab (right-click, then select "Open New Tab").
You can append & to the command you run. Be aware that you will not see text output to the terminal, such as error messages.
You can type Ctrl-Z and then run bg. This has the same effect as running command &
You can run nohup command & and then press enter. (Thanks to ccpizza, see comments below.)

However, pressing Alt-F2 and then running your command from the GUI is usually considered best practice - there is no terminal at all!

Note that when using & (not nohup), closing the terminal will still terminate the application unless you run disown afterwards.

EDIT: It looks like using nohup will sometimes leave little droppings in your home folder. What would normally have been logged to the terminal is apparently saved to a file in ~/.

A simple way to run a program in the background is program-name & disown, which will drop you to a terminal which can be closed without killing the process.

WindowsEscapist

Posted 2012-12-02T01:22:56.560

Reputation: 1 828

program-name & disown is a nice solution – Doctor Henry – 2019-08-03T12:34:18.217

4To prevent killing the child process after the terminal is closed you can start your app as nohup firefox&. – ccpizza – 2012-12-03T22:25:44.220

Cool! I didn't know that (but upon experimentation, the terminal is still "blocked")! – WindowsEscapist – 2012-12-03T23:35:40.257

it is not 'blocked', it only 'looks' blocked, if you type enter once you will get a prompt. – ccpizza – 2012-12-04T21:07:17.027

Ah, I didn't notice that before. – WindowsEscapist – 2012-12-05T00:06:32.543

You can run the command with a & after.

For example:

thunderbird &

See Here for more info.

Viertaxa

Posted 2012-12-02T01:22:56.560

Reputation: 369

This works only until you close the terminal window, once you close the window the program will terminate – kurdtpage – 2018-07-06T01:20:53.940

You can use setsid to run program in a new session with addition to &>/dev/null so you will not receive any log messages.

So it would be like

setsid program-name &>/dev/null

Rumid

Posted 2012-12-02T01:22:56.560

Reputation: 161

Cool. It must keep process running when user logout and current session closed. – Mikhail Moskalev – 2019-03-07T15:40:38.177

Using screen command, you can open multiple terminal sessions using a single window

apt-get install screen (On Debian based Systems)

yum install screen (On RedHat based Systems)

screen (start new screen)

[Your command]

Ctrl+A d to leave screen ... and so on

https://linuxize.com/post/how-to-use-linux-screen/

Ahmed Ismail

Posted 2012-12-02T01:22:56.560

Reputation: 121

You can run it in a virtual terminal like tmux (or screen but I heard it's not maintained anymore)

# This ataches your terminal to a virtual terminal
tmux
run_your_command
# This detaches your virtual terminal (previous command can be running)
CTRL-b d
run_other_commands # on your terminal
# re-attach the virtual terminal to see the status of run_your_command
tmux a

tmux can do a lot more, like :

move your virtual terminal to another terminal
share the virtual terminal in several terminals (other users can see what your doing ;-) )
split the "screen" to have several terminals.
...

https://www.hamvocke.com/blog/a-quick-and-easy-guide-to-tmux/

Sebastien DA ROCHA

Posted 2012-12-02T01:22:56.560

Reputation: 101