The Process management tool uses

Pstree, PS, Pidof, Pgrep, top, Htop

I. Pstree-display a tree of processes

1 Yum Install Psmisc//package contains commands Pstree, Killall, Fuser

Ii.ps-report A snapshot of the current processes

   Usage:PS [options]                           u: User-centric organization process state information display                A: terminal-related process                x: terminal-independent process                      -e: Show All Processes               -f: Show full format program information               -F: Show process information in full format-               h: Show process-related information                in process-level format    

Instance:

PS auxuser        PID%cpu%MEM    VSZ   RSS TTY      STAT START time   commandroot          1  0.0  0.6 193468  6576?        Ss   13:49   0:01/usr/lib/systemd/systemd--switched-root--systemroot          2  0.0  0.0      0     0?        S    13:49   0:00 [Kthreadd]  

The entry meaning:    USER: Process is the main    PID: Process ID    %cpu:cpu occupied time than    the%MEM: Memory consumption time than    vsz:virtual Virtual memory Set    rss:resident Size, resident memory set    TTY: Terminal    START: Process status            r:running            S:  interruptable Sleeping            d:uninterruptable sleeping            t:stopped            Z:zombie            +: Foreground process            L: Multithreaded process            N: Low-priority process            <:  high-priority process            S:   session leader    start: Start time    : The cumulative duration of the process consuming CPU           CO Mmand: Which command the    process runs from   

[Email protected] ~]#PS-efuid PID PPID C stime TTY time Cmdroot1      0  0  -: the?xx:xx: Geneva/usr/lib/systemd/systemd--switched-root--system--deserialize2Root2      0  0  -: the?xx:xx:xx[Kthreadd]
Each entry means:
UID: Process belongs to master ID
PID: Process ID
PPID: Parent Process ID
C:CPU number
Stime:start time
TTY: Terminal
Time: Process consumes CPU cumulative duration

[Email protected] ~]#PS-efhuid PID PPID C SZ RSS PSR stime TTY time Cmdroot2      0  0     0     0   1  -: the?xx:xx:xx[Kthreadd]root3      2  0     0     0   0  -: the?xx:xx:xx[ksoftirqd/0]

Ps-eo {Pid,tid,class,rtprio,ni,pri,psr,pcpu,stat,comm}
Ps-axo {Stat,euid,ruid,tty,tpgid,sess,pgrp,ppid,pid,pcpu,comm}

Ni:nice value

Pri:priority, priority

Psr:processor,cpu

Rtprio: Real-time priority

Third,pgrep, pkill-look up or signal processes based on name and other attributes

usage: pgrep [options] Pattern         pkill [options] Pattern                -u uuid:effective user, valid user ID                -  U uuid:real User, actual userid                -t terminal: Process                associated with the specified terminal -L: Show process name                 -A: Show process name in full format                 -P PID: Displays a list of processes whose parent process is specified for this purpose

Iv.Pidof-Find the process ID of a running program, obtaining its PID based on the process name

Five, Top-display Linux processes, dynamic display of process status

[email protected] ~]# Top

Top- +: +: -Up5: -,3Users, load average:0.00,0.01,0.05Tasks:117Total1Running theSleeping,2Stopped0Zombie%CPU (s):0.0us0.0Sy0.0Ni99.8 ID,0.2Uan0.0Hi0.0Qin0.0Stkib Mem:997980Total454352  Free,154824Used,388804buff/Cachekib Swap:2097148Total2097148  Free,0Used.647980avail Mem PID USER PR NI VIRT RES SHR S%CPU%MEM time+COMMAND703Root -   0  298712   6112   4784S0.3  0.6   0:24.18VMTOOLSD1Root -   0  193468   6576   4088S0.0  0.7   0:02.07systemd2Root -   0       0      0      0S0.0  0.0   0:00.01Kthreadd
Built-in commands:
Sort:
P: Sort by percentage of CPU occupied
M: Sort by percentage of memory occupied
T: Sort by cumulative CPU duration
First message display and close: L key
Tasks and CPU information display and shutdown: T key
CPU displayed separately: Number 1
Memory Information: M key
Modify Refresh time interval: s key
Terminate specified process: K key
Exit command: Q key
Options:
-D #: Specifies the refresh interval, which defaults to 3 seconds
-B: Displayed in batch mode
-N #: Shows how many batches
First line:
top-19:43:38 up 5:53, 3 users, load average:0.00, 0.01, 0.05
Current system time long runtime average number of users logged on in the current system (last minute, five minutes, 15 minutes)
Second line:
tasks:117 Total, 1 running, sleeping, 2 stopped, 0 zombie
Number of processes running the number of processes running state the number of processes in the sleep state processes number of dead states
Third line
%CPU (s): 0.0 us, 0.0 sy, 0.0 ni, 99.8 ID, 0.2 wa, 0.0 hi, 0.0 si, 0.0th
Percentage of user space program occupied kernel space Nice value idle scale wait time for IO to finish processing hardware interrupt handling soft interrupt (mode switch) time spent in virtualization technology
Line Four
KiB mem:997980 Total, 454352 free, 154824 used, 388804 Buff/cache
Physical memory total space free space used space buff and cache occupied space
KiB swap:2097148 Total, 2097148 free, 0 used. 647980 Avail Mem
Total Space free space available
PID USER PR NI VIRT RES SHR S%cpu%MEM time+ COMMAND
Process number process is Master priority Nice value virtual memory set resident memory set shared memory size process state   

　　

The Process management tool uses