knowing what's running on Ubuntu

Sometimes, I left my beaglebone running over night, and next morning I can't remember what's running on back ground.
the command ps can be help.
http://www.cyberciti.biz/faq/show-all-running-processes-in-linux/

with out additional parameter, it list what I own. the PID is Process Identification
ubuntu@arm:~$ ps
  PID TTY          TIME CMD
12914 pts/0    00:00:00 bash
17211 pts/0    00:00:00 ps

there are options:
  • -A: select all processes
  • a: select all processes on a terminal, including those of other users
  • x: select processes without controlling ttys

with ps a I can see if my python program is running for how long..

ubuntu@arm:~$ ps a
  PID TTY      STAT   TIME COMMAND
  534 tty4     Ss+    0:00 /sbin/getty -8 38400 tty4
  536 tty5     Ss+    0:00 /sbin/getty -8 38400 tty5
  544 tty2     Ss+    0:00 /sbin/getty -8 38400 tty2
  545 tty3     Ss+    0:00 /sbin/getty -8 38400 tty3
  549 tty6     Ss+    0:00 /sbin/getty -8 38400 tty6
  760 tty1     Ss+    0:00 /sbin/getty -8 38400 tty1
  761 ttyO0    Ss     0:00 /bin/login --
  850 ttyO0    S      0:00 -bash
  895 ttyO0    Sl+  1525:27 python python_test_bone_try9_data_receive_assem_gdat
12914 pts/0    Ss     0:00 -bash
17580 pts/0    R+     0:00 ps a
ubuntu@arm:~$

Once we know the PID, we can stop it wirh kill PID

 ubuntu@arm:~$ kill 895
ubuntu@arm:~$ ps a
  PID TTY      STAT   TIME COMMAND
  534 tty4     Ss+    0:00 /sbin/getty -8 38400 tty4
  536 tty5     Ss+    0:00 /sbin/getty -8 38400 tty5
  544 tty2     Ss+    0:00 /sbin/getty -8 38400 tty2
  545 tty3     Ss+    0:00 /sbin/getty -8 38400 tty3
  549 tty6     Ss+    0:00 /sbin/getty -8 38400 tty6
  760 tty1     Ss+    0:00 /sbin/getty -8 38400 tty1
  761 ttyO0    Ss     0:00 /bin/login --
  850 ttyO0    S+     0:00 -bash
12914 pts/0    Ss     0:00 -bash
18007 pts/0    R+     0:00 ps a

ubuntu@arm:~$

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