DSL2 nextflow stopped when put into background in shell

[rithy8]

Bug report

bash shell running nextflow stopped when running in background mode. When running in foreground everything worked.

Expected behavior and actual behavior

nextflow should continue to run when launched in background mode.

Steps to reproduce the problem

Below is my script. I ran it with the following command line:

nextflow run dotestsub.nf 2>&1 > foo.txt &
And, when I tailed foo.txt, nextflow stuck at this line:

N E X T F L O W  ~  version 19.05.0-edge
Launching `dotestsub.nf` [disturbed_liskov] - revision: cfa14e665c
WARN: DSL 2 IS AN EXPERIMENTAL FEATURE UNDER DEVELOPMENT -- SYNTAX MAY CHANGE IN FUTURE RELEASE
[warm up] executor > sge

When I type jobs -l, my system showed the following:

[1]+ 29350 Stopped (tty output)    nextflow run dotestsub.nf 2>&1 > foo.txt

nextflow.preview.dsl=2

process sayHello {
  echo true
  cpus 1
  memory '1 GB'
  container interopImage
  clusterOptions = '-l h_vmem=1G ' + '-S /bin/bash -l docker_version=new -P onco'
  executor = 'sge'
  queue = 'all.q'
  penv = 'smp'

  input:
      val(aaa)
  script:
  """
  echo "hello" > hello.txt
  """
}

sayHello("bbb")

Program output

N E X T F L O W  ~  version 19.05.0-edge
Launching `dotestsub.nf` [disturbed_liskov] - revision: cfa14e665c
WARN: DSL 2 IS AN EXPERIMENTAL FEATURE UNDER DEVELOPMENT -- SYNTAX MAY CHANGE IN FUTURE RELEASE
[warm up] executor > sge

When I type jobs -l, my system showed the following:

[1]+ 29350 Stopped (tty output)    nextflow run dotestsub.nf 2>&1 > foo.txt

Environment

• Nextflow version: [19.05.0-edge]
• Java version: [1.8.0_92]
• Operating system: [CentOS Linux]

Additional context

Please help me. Thanks

[pditommaso]

When running in the background you should specify the -bg command-line option.

[rithy8]

Oh, did not know nextflow has background option. Thank you.

[grayshiwb512]

Thank you, @pditommaso !
Does the "-bg" command-line option documented? I search the documentation and cannot find it as shown below,

thanks,
Paul

[pditommaso]

It should, so far the only doc is available through nextflow run -h