root@ubuntu:/home/zoer# cat daemon.py
#!/usr/bin/env python
import time
import os
time.sleep(1)
f=open("log",'a')
t=time.time()
f.write(str(t))
f.write("\n")
f.close()

root@ubuntu:/home/zoer# supervisord 
/usr/local/lib/python2.7/dist-packages/supervisor-3.0b1-py2.7.egg/supervisor/options.py:286: UserWarning: Supervisord is running as root and it is searching for its configuration file in default locations (including its current working directory); you probably want to specify a "-c" argument specifying an absolute path to a configuration file for improved security. 
 'Supervisord is running as root and it is searching ' 
root@ubuntu:/home/zoer# supervisorctl 
ddd               STARTING   
supervisor> start ddd 
ddd: ERROR (already started) 
supervisor> stop ddd 
ddd: stopped 
supervisor> start ddd 
ddd: started 
supervisor>

root@ubuntu:/home/zoer# cat daemon.py  
#!/usr/bin/env python 
import time 
import os 
while True: 
  time.sleep(1) 
  f=open("log",'a') 
  t=time.time() 
  f.write(str(t)) 
  f.write("\n") 
  f.close()

root   9354 0.2 0.4 10924 4200 ?    S  23:16  0:00 python /home/zoer/daemon.py 
root   9395 0.0 0.0  4392  832 pts/3  S+  23:17  0:00 grep --color=auto daemon 
root@ubuntu:/home/zoer#

root@ubuntu:/home/zoer# rm log;touch log;kill 9354
root@ubuntu:/home/zoer# cat log 
1364710712.51 
root@ubuntu:/home/zoer# cat log 
1364710712.51 
1364710713.51 
root@ubuntu:/home/zoer# cat log 
1364710712.51 
1364710713.51 
root@ubuntu:/home/zoer# cat log 
1364710712.51 
1364710713.51 
1364710714.52 
root@ubuntu:/home/zoer# cat log 
1364710712.51 
1364710713.51 
1364710714.52 
1364710715.52

root   9429 0.1 0.4 10924 4200 ?    S  23:18  0:00 python /home/zoer/daemon.py 
root   9440 0.0 0.0  4392  828 pts/3  S+  23:19  0:00 grep --color=auto daemon 
root@ubuntu:/home/zoer#