find_instaled.sh

import glob, subprocess

def run_command(command): # found this on stackoverflow
  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
  return iter(p.stdout.readline, b'')
  
iFiles = glob.glob("/var/log/apt/history.log*")
iFiles.sort(reverse=True) # to get the files in date order but not really critical
for f in iFiles:
  command = ['zcat', '-f', f]
  for line in run_command(command):
    if "Start-Date:" in line:
      sp_ln = line.split(" ")
      print sp_ln[1].strip(),
    elif "Commandline:" in line:
      sp_ln = line.partition(" ")
      print sp_ln[2].strip()