Jan-27-2018, 01:43 PM
I have found out how to do it now.
fout="/home/norman/khconf/third.txt" fo = open(fout, 'w') cat = subprocess.Popen(['cat', 'second.txt'], stdout=subprocess.PIPE, ) sort = subprocess.Popen(['sort'], stdin=cat.stdout, stdout=subprocess.PIPE, ) uniq = subprocess.Popen(['uniq'], stdin=sort.stdout, stdout=fo )