[ALUG] sudo &
steve-ALUG at hst.me.uk
steve-ALUG at hst.me.uk
Tue Jun 13 09:41:36 BST 2017
On 08/06/17 13:08, Mark Rogers wrote:
> To expand on the reason I asked: Today I ran out of disk space and
> started going through a tidy up. I found some large directories
> (unused virtual machines that I don't want to throw away but don't
> really need either) that I wanted to compress. So I used:
> vm=vm1 ; sudo tar -cjf $vm.tar.bz2 --remove-files $vm &
> .. which worked fine as I had already done some tasks with sudo by
> that point so no password was needed.
> a while later I came back (after it had finished), edited the command
> to backup vm2, hit enter and got on with other tasks again. Of-course
> my sudo session had timed out, and whilst nothing looked any different
> it was sat there doing nothing and I didn't realise for a few hours,
> when "jobs" showed me that the task was stopped.
> In this scenario, unless I enable password-less sudo, /etc/sudoers doesn't help.
> I did find one useful suggestion after more Googling that created a
> "sudobg" alias which looks like the best option so far.
Sometimes it helps to explain why you want what you want, then people
can give a more informed answer.
Type screen then enter. You'll get a page of intro, then you're in a
terminal window. Start your commands. Don't worry about trying to
Once it's started, press CTRL+A, then D. CTRL+A grabs screen's
Attention, then you Detach from it. The screen-ed commands continue,
even if you close the terminal window. To get back to it, use screen -r
for re-attach from any terminal window.
Screen is an extremely useful command, especially over ssh or some sort
of remote login, because if the connection is lost due to connection
problems, the commands continue executing on the remote machine, and/or
you can start something on a home machine via ssh from work, and then
look at results on the home machine when you get home.
Commands run under screen will run at normal priority. If you want them
to run with lower priority, use nice, or renice and/or ionice....
sudo nice -n 10 SomeCommand
ps -Af | grep "SomeCommand"
[look for the PID of SomeCommand]
sudo renice -n 10 -p PID
sudo ionice -c 3 -p PID
Obviously, look at man for screen, nice, renice and ionice for more info.
Alternatively, not using screen, type your commands into a command
window. Once the commands have started, simply press CTRL+Z. This
sends that command to the background, then use bg to restart it in the
background. Info here...
Alternatively, put all your commands into a shell script then sudo
Alternatively and possibly not recommended, use sudo -i to become root,
then run all your commands in that window. It will only as for the
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