Show all processes
To see all the processes, run the ps command with the "-a" option.
If you want to see the processes executed by the logged-in user, you can use the "-a" option without any arguments, but if you want to see which processes are being executed by other users, you can use the "-u" option as well.
| root@Lion:~# ps -a PID TTY TIME CMD 29939 pts/0 00:00:00 su 29940 pts/0 00:00:00 bash 30036 pts/0 00:00:00 su 30037 pts/0 00:00:00 bash 30040 pts/0 00:00:00 su 30041 pts/0 00:00:00 bash 30120 pts/0 00:00:00 su 30121 pts/0 00:00:00 bash 30124 pts/0 00:00:00 ps root@Lion:~# ps -au USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 11621 0.0 0.0 3784 464 tty1 Ss+ 9月07 0:00 /sbin/agetty -o -p -- \u --noclea nuy 29936 0.0 0.1 5824 4344 pts/0 Ss 10:13 0:00 -bash root 29939 0.0 0.0 8108 3564 pts/0 S 10:13 0:00 su - root 29940 0.0 0.1 5824 4336 pts/0 S 10:13 0:00 -bash root 30036 0.0 0.0 7960 3240 pts/0 S 11:01 0:00 su - root 30037 0.0 0.1 5824 4408 pts/0 S 11:01 0:00 -bash root 30040 0.0 0.0 7960 3516 pts/0 S 11:01 0:00 su - nuy nuy 30041 0.0 0.1 5824 4520 pts/0 S 11:01 0:00 -bash root 30120 0.0 0.0 8108 3576 pts/0 S 11:14 0:00 su - root 30121 0.1 0.1 5824 4388 pts/0 S 11:14 0:00 -bash root 30125 0.0 0.0 8804 3040 pts/0 R+ 11:15 0:00 ps -au |
Information to be displayed
PID：A number that is automatically assigned to each process
TTY：Control terminal running the process
STAT：state
・Field 1
R：executable
T：Stopping or tracing
D：Dormant and uninterruptible.
S：dormant
Z：zombie（Not deleted, but suspended）
・Field 2
W：swapped out（No resident pages）
・Field 3
N：positive nice value
TIME：CPU consumption time
COMMAND：Execute command