How to bring a background program to foreground

Question

I am working on CentOS6, and running a django server for my development on a tmux session as：

python manage.py runserver 0.0.0.0:8000

So I can read my debug string print on it.

While there is an unknown reason which made my tmux session lost, and I cannot to bak to my working session using "tmux attach" command.

I still can find my server is running by ps command, but I have no permission to kill this in order to run a new server on the same port.

So, I want to call this backgound server to frontgound again.

As I never use ctrl+z or other ways to take process background, so even I use jobs command, there are no jobs.

But I dont know if I can do this, and how to do this...

Thanks all！！

Answer 1

Use the jobs command to find the list of background processes that are started by you. for eg: there is script which simply sleeps for 10 secs in 5 iterations.I ran it 4 times in the background.

>jobs
[1]  + Running                       ./temp.sh
[2]  - Running                       ./temp.sh
[3]    Running                       ./temp.sh
[4]    Running                       ./temp.sh

fg is the command to bring it back to the foreground as shown below.

>fg 1
[CTRL -c]

as seen above i have ended the process and it no longer exists. now if i again run jobs

>jobs
[2]  + Running                       ./temp.sh
[3]    Running                       ./temp.sh
[4]  - Running                       ./temp.sh
>

Also you can check here for more

Answer 2

You can use the command jobs to obtain a list of your jobs, then you can use fg <number of job> to bring that job to the front.