Both are used to display the specified process information but also slightly different,
1 ps -ef
ps -ef process is a standard format, it returns the following results:
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 2019 ? 00:00:38 /usr/lib/systemd/systemd --switched-root --system --deseria
root 2 0 0 2019 ? 00:00:00 [kthreadd]
root 4 2 0 2019 ? 00:00:00 [kworker/0:0H]
root 6 2 0 2019 ? 00:02:23 [ksoftirqd/0]
root 7 2 0 2019 ? 00:00:00 [migration/0]
root 8 2 0 2019 ? 00:00:00 [rcu_bh]
root 9 2 0 2019 ? 00:10:31 [rcu_sched]
root 10 2 0 2019 ? 00:00:00 [lru-add-drain]
root 11 2 0 2019 ? 00:00:18 [watchdog/0]
...
Wherein the meaning of each column as follows:
| Column Name | meaning |
|---|---|
| UID | User ID, but the output is the user name |
| PID | Process ID |
| PPID | The parent process ID |
| C | Process CPU percentage of |
| ESTIMATES | The time now to start the process |
| TTY | The process running on the terminal, if nothing to do with the terminal, the display? If it is pts / 0, etc., is represented by a network connection to the host process. |
| CMD | Name and parameters of the command |
2 ps aux
ps aux BSD format is displayed, it returns the following results:
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.1 43532 3748 ? Ss 2019 0:38 /usr/lib/systemd/systemd --switched-root -
root 2 0.0 0.0 0 0 ? S 2019 0:00 [kthreadd]
root 4 0.0 0.0 0 0 ? S< 2019 0:00 [kworker/0:0H]
root 6 0.0 0.0 0 0 ? S 2019 2:23 [ksoftirqd/0]
root 7 0.0 0.0 0 0 ? S 2019 0:00 [migration/0]
root 8 0.0 0.0 0 0 ? S 2019 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? R 2019 10:31 [rcu_sched]
root 10 0.0 0.0 0 0 ? S< 2019 0:00 [lru-add-drain]
root 11 0.0 0.0 0 0 ? S 2019 0:18 [watchdog/0]
...
Wherein the meaning of each column as follows:
| Column Name | meaning |
|---|---|
| USER | username |
| %CPU | CPU percentage occupied by the process |
| %MEM | The percentage of occupied memory |
| VSZ | Amount of virtual memory (KB) used by this process |
| RSS | A fixed amount of memory (KB) consumed by this process (the number of pages that reside) |
| STAT | Status of the process |
| START | The process is triggered start time |
| TIME | The actual process of using the CPU running time |
STAT state where the common position of the status characters are:
| Field | meaning |
|---|---|
| D | Not interrupt sleep (usually IO process) |
| R | Running can be had in the queue line; |
| S | In a dormant state; |
| T | / Stops or track; |
| W | Into the memory swap (invalid from the beginning of a kernel 2.6) |
| X | Dead process (basic rare) |
| FROM | Zombie process |
| < | High-priority process |
| N | // lower priority process |
| L | Some pages are locked into memory; |
| s | / Process leaders (there are child processes under it); |
| l | Multi-threaded, the thread cloning (using CLONE_THREAD, similar NPTL pthreads); |
| + | In the background process group |
