code: def sh3(cmd):
      """
      Execute command in a subshell, return stdout, stderr
      If anything appears in stderr, print it out to sys.stderr
  
      https://github.com/scikit-image/scikit-image/blob/master/doc/gh-pages.py
  
      Copyright (C) 2011, the scikit-image team All rights reserved.
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:
  
      Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
      Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
      Neither the name of skimage nor the names of its contributors may be used
      to endorse or promote products derived from this software without specific
      prior written permission.
  
      THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
      BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
      USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      """
      p = Popen(cmd, stdout=PIPE, stderr=PIPE, shell=True)
      out, err = p.communicate()
      retcode = p.returncode
      if retcode:
          raise CalledProcessError(retcode, cmd)
      else:
          return out.rstrip(), err.rstrip()
  
file_path: dipy/doc/tools/docgen_cmd.py
imports: import os
  from os.path import join
  from subprocess import Popen, PIPE, CalledProcessError
  import sys
  import importlib
  import inspect
  from packaging.version import Version
label_desc: Use image node_id 1 for calling a global function with example usage: sh3(cmd) and returns: out,  err