35. Common Linux Shell functions, PS

1. Description

Report a snapshot of the current processes.

PS [Options]

2. Common options

①L long format output;

②U displays processes in the username and start time order;

③J. display processes in the task format;

④F process is displayed in a tree format;

⑤A/e displays all processes of all users (including other users );

⑥X displays the process of the uncontrolled terminal;

7.R: displays running processes;

BytesWW to avoid detailed parameter truncation;

Explanation of execution results

①Owner of the user process;

②PID process ID;

③Ppid parent process;

④% Percentage of CPU used by CPU processes;

⑤% Mem memory usage percentage;

⑥Nice value of the Ni process. The value is large, indicating that the CPU time is less occupied;

7.Virtual size of vsz process;

BytesNumber of pages in RSS resident;

BytesWchan

BytesTty terminal ID

11Stat Process status

A.D uninterruptible sleep (usually Io)

B.R is running and can be crossed in the queue;

C.S is in sleep state;

D.T stop or be tracked;

E.W enters the memory switch (it is invalid from kernel 2.6 );

F.X dead processes (never seen );

G.Z botnets;

H.N processes with lower priority

I.L some pages are locked into the memory;

J.S process leader (with sub-processes under it );

K.L is multi-threaded (using clone_thread, like nptl pthreads do)

L.+ Process group in the background;

①Wchan Waiting process resources;

②The start time of the process;

③Time CPU consumption time of processes;

④Command name and parameters;

3. Example

PS aux

PS-auxf

Reference

[1]Http://linux.die.net/man/1/ps

Http://www.linuxsir.org/main/node/210