import os
p = '/home/abmtgrou/en.tupyfittings.com/stderr.log'
size = os.path.getsize(p)
with open(p, 'rb') as fh:
    fh.seek(max(0, size - 6000))
    data = fh.read().decode('utf-8', 'replace')
open('/home/abmtgrou/en.tupyfittings.com/tail.out', 'w').write(data)
open(p, 'w').close()
print('size was', size)