Questions about the various ways jobs can be controlled by the shell: suspending, resuming, terminating execution etc.

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109
votes
8answers
54k views

How can I disown a running process and associate it to a new screen shell?

I have a running program on a SSH shell. I want to pause it and be able to unpause its execution when I come back. One way I thought of doing that was to transfer its ownership to a screen shell, ...
232
votes
2answers
63k views

Difference between nohup, disown and &

What is the difference between $ nohup foo and $ foo & and $ foo & $ disown
20
votes
4answers
5k views

What happens to the output of a process that has been disowned and lost its terminal?

If I close the virtual terminal, where some process was started, does the output just go straight to /dev/null, or can it pollute memory somehow? Can I anyhow grab the output to continue reading it at ...
19
votes
5answers
12k views

How can I close a terminal without killing its children (without running `screen` first)?

sometimes I run an app in the gnome-terminal, but then I suddenly have to restart gnome or something. I guess the answer to the question is also useful then I want to disconnect from SSH where ...
27
votes
2answers
12k views

What is the difference between a job and a process?

What is the difference between a "job" and a "process"?
58
votes
4answers
100k views

How to suspend and bring a background process to foreground

I have a process originally running in the foreground. I suspended by Ctrl+Z, and then resume its running in the background by bg <jobid>. I wonder how to suspend a process running in the ...
4
votes
1answer
1k views

Difference between process group and job?

What's the difference between a process group and a job? If I type pr * | lpr then is it both a process group as well a job? What exactly is the difference between a process group ID and a job ID? ...
1
vote
2answers
1k views

Basic job control: stop a job, add a job onto the stack, and `fg`

Job control is probably my favorite thing about Linux. I find myself, often, starting a computationally demanding process that basically renders a computer unusable for up to days at a time, and being ...
9
votes
1answer
5k views

Non-blocking bash command

Let's say I have a bash script with the following: #!/bin/sh gedit rm *.temp When I execute it using sh ./test.sh, gedit pops-up but the rm part does not run until after I close gedit. I want the ...
1
vote
2answers
408 views

What is the real-world use of the bg command?

This is the output: [USER@SERVER ~] ping localhost PING localhost (127.0.0.1) 56(84) bytes of data. 64 bytes from localhost (127.0.0.1): icmp_seq=1 ttl=64 time=0.037 ms 64 bytes from localhost ...
32
votes
2answers
28k views

How to suspend and resume processes

In the bash terminal I can hit Control+Z to suspend any running process... then I can type fg to resume the process. Is it possible to suspend a process if I only have it's PID? And if so, what ...
13
votes
2answers
2k views

Concept of controlling terminal in Unix

Can some one please explain in an easy to understand way the concept of controlling terminal in unix and unix like systems ? Is it related to a session ? If yes, then how ?
10
votes
1answer
9k views

How to suspend and resume processes like bash does

this question is a follow-up to: How to suspend and resume processes I have started firefox from a bash session in gnome-terminal. The process tree looks like this: $ ps -e -o pid,ppid,cmd -H 1828 ...
6
votes
2answers
1k views

Is it possible to transfer a running process to your terminal? [duplicate]

Possible Duplicate: How can I pause up a running process over ssh, disown it, associate it to a new screen shell and unpause it? It is fairly easy to disown a process, or make it run ...
3
votes
1answer
171 views

What is the purpose of abstractions, session, session leader and process groups?

I understand from Informit article that sessions and process groups are used to terminate descendant processes on exit and send signals to related processes with job control. I believe this ...
5
votes
1answer
463 views

Can someone explain in detail what “set -m” does?

On the man page, it just says: -m Job control is enabled. But what does this actually mean? I came across this command in a SO question, I have the same problem as OP, which is "fabric cannot ...
5
votes
4answers
2k views

disabling job control in bash (CTRL-Z)

It happens to me sometimes, that I press CTRL+Z by accident and my application disappears into background. I know, I can bring it back with fg, so it's not such a big deal. But I am wondering about ...
3
votes
1answer
434 views

Background task finished notification syntax

Last night, before abandoning my computer for the evening, I started a bunch of compiler jobs so they'd be ready in the morning, using make -f alpha.mak &>alpha.out &. When I came back and ...