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Display the status of a process

Display the status of a process

To view the processes, use the ps command.
When the ps command is executed, it will display the process information based on the information under /proc.
If the ps command is executed without any options, the process status of the user who executed the command will be displayed.

root@Lion:~# ps
  PID TTY          TIME CMD
29939 pts/0    00:00:00 su
29940 pts/0    00:00:00 bash
30035 pts/0    00:00:00 ps
↑ Show the running processes of root

root@Lion:~# su –
root@Lion:~# su – nuy                           
nuy@Lion:~$ ps
  PID TTY          TIME CMD
29936 pts/0    00:00:00 bash
30041 pts/0    00:00:00 bash
30044 pts/0    00:00:00 ps                           
↑ Show running processes for user nuy

●View the process status in detail

To display the process status in detail, run the ps command with the option “-l”.

nuy@Lion:~$ ps -l
F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD
0 S 1000 29936 29935 0 80 0 – 1456 – pts/0 00:00:00 bash
4 S 1000 30041 30040 0 80 0 – 1456 – pts/0 00:00:00 bash
0 R 1000 30046 30041 0 80 0 – 2180 – pts/0 00:00:00 ps 

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

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