jobcontrol.vim

function! s:JobHandler(job_id, data, event) dict
  if a:event == 'stdout'
    let str = self.shell.' stdout: '.join(a:data)
  elseif a:event == 'stderr'
    let str = self.shell.' stderr: '.join(a:data)
  else
    let str = self.shell.' exited'
  endif

  call append(line('$'), str)
endfunction
let s:callbacks = {
\ 'on_stdout': function('s:JobHandler'),
\ 'on_stderr': function('s:JobHandler'),
\ 'on_exit': function('s:JobHandler')
\ }
let job1 = jobstart(['bash'], extend({'shell': 'shell 1'}, s:callbacks))
let job2 = jobstart(['bash', '-c', 'for i in {1..10}; do echo hello $i!; sleep 1; done'], extend({'shell': 'shell 2'}, s:callbacks))
let job3 = jobstart(['/home/daikimaekawa/neovim.cpp/build/test'], extend({'shell': 'shell 3'}, s:callbacks))

do this. $ nvim -u NONE -S /path/to/jobcontrol.vim