Common commands for viewing system information in Linux

Guide

Linux is a magical and efficient operating system, after learning Linux to have a familiar understanding of Linux systems, you need to understand these practical commands to view system information.

View System version commands uname

When it comes to the system version, you'll think of uname. View System Kernel version

uname-Parameters

What other-n-m-R parameters are ignored, direct-a

[[Email protected] ~] #uname-alinux linuxprobe.com 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 11:47:41 EST. x86_64 x86_64 x86_64 Gnu/linux[[email protected] ~]#

It seems to be a lot of information from uname, but it doesn't seem like I want it, and there's no version of the system.

lsb_release-a

Red Hat Enterprise Linux Server release 6.4 (Santiago) Release:6.4codename:santiago[[email protected] ~]#

cat/etc/issue

[[Email protected] ~] #cat/etc/issueRed Hat Enterprise Linux Server release 6.4 (Santiago)Kernel \ r on an \m[[ema Il protected] ~]#

View memory-related Free

When it comes to Linux memory, I think of a command free, which is explained in the Linux commands that novice must master in the 2nd chapter of the textbook.

[Email protected] ~]# free total                   used free     shared    buffers     cachedMem:       5228872     669360    4559512          0      28060     266936-/+ buffers/cache:     374364    4854508Swap:      4194296          0    4194296[[email protected] ~]# free-m             total       used       free     shared    Buffers     cachedmem:          5106        653       4452          0        260-/+ buffers/cache:        365       4740Swap:         4095          0       4095[[email protected] ~]# free-g             total       used       free     shared    buffers     cachedmem:             4          0          4          0          0          0-/+ buffers/cache:          0          4Swap:            3          0          

Obviously memory size, how much to use, how much remains, buffers and cached, and swap conditions at a glance, using parameters-m/-g can specify units

View CPU-related Uptime

[[email protected] ~]# uptime 20:09:48 up min,  3 users,  load average:0.35, 0.25, 0.11    //System average load, 1 min, 5 min Clock, 15 minutes          

Top

Real-time monitoring of the system's CPU and memory, default 3s refresh once

[Email protected] ~]# toptop-20:15:41 up min, 3 users, load average:0.41, 0.38, 0.21tasks:236 total, 1 running , 235 sleeping, 0 stopped, 0 zombiecpu (s): 0.2%us, 0.5%sy, 0.0%ni, 98.8%id, 0.5%wa, 0.0%hi, 0.0%si, 0.0%stmem:5228872  K Total, 671136k used, 4557736k free, 28324k buffersswap:4194296k total, 0k used, 4194296k free, 267360k Cached    PID USER PR NI VIRT RES SHR S%cpu%MEM time+ COMMAND 1 root 20 0 19360 153 6 1224 s 0.0 0.0 0:05.37 init 2 Root 0 0 0 0 S 0.0 0.0 0:00.02 kth Readd 3 root RT 0 0 0 0 S 0.0 0.0 0:00.07 migration/0 4  Root 0 0 0 0 S 0.0 0.0 0:00.14 ksoftirqd/0 5 root RT 0 0 0 0 s 0.0 0.0 0:00.00 migration/0 6 root RT 0 0 0 0 S 0.0 0.0 0:00.01 watchdog/      0 7 root RT 0 0 0 0 S 0.0 0.0 0:00.69 MIGRATION/1 8 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/1 9 Root 0 0 0 0 S 0.                      0 0.0 0:00.10 ksoftirqd/1 root RT 0 0 0 0 S 0.0 0.0 0:00.00 WATCHDOG/1 Root      RT 0 0 0 0 S 0.0 0.0 0:00.10 MIGRATION/2 root RT 0 0 0 0 S                     0.0 0.0 0:00.00 MIGRATION/2 Root 0 0 0 0 S 0.0 0.0 0:00.01 KSOFTIRQD/2      Root RT 0 0 0 0 S 0.0 0.0 0:00.00 WATCHDOG/2 Root RT 0 0 0 0 S 0.0 0.0 0:00.17 MIGRATION/3 root RT 0 0 0 0 S 0.0 0                     .0 0:00.00 MIGRATION/3 root 0 0 0 0 S 0.0 0.0 0:00.06 KSOFTIRQD/3      Root RT 0 0 0 0 S 0.0 0.0 0:00.00 WATCHDOG/3 Root 20 0   0 0 0 S 0.0 0.0 0:00.41 events/0

CPU memory real-time utilization with this as the standard

View CPU Parameters--Files:/proc/cpuinfo

[Email protected] ~]#  cat/proc/cpuinfo | grep "Physical ID" | uniq | wc-l2                                              //CPU number [[email protected] ~]# Cat/proc/cpuinfo | grep "CPU Cores" | Uniqcpu cores:2                           //number of threads [[email protected] ~]# Cat/proc/cpuinfo | grep ' model name ' |uniqmodel Name:inte L (R) Core (TM) i5-3230m CPU @ 2.60GHz                                             //cpu model parameter

view hard disk related DF

[[email protected] ~]# DF File system         1k-block      used      available% mount point/dev/sda2 41284928 469040 38718736   2%/ Tmpfs                  2614436       224   2614212   1%/dev/shm/dev/sda1                99150     32504     61526  35%/ Boot/dev/sda6               516040     18016    471812   4%/home/dev/sda3              4128448   2542976   1375760  65%/usr[[email protected] ~]# df-h                     //In a simple way to see the file system      capacity  has been used with the available percent  mount point/dev/sda2              40G  459M   37G   2%/ Tmpfs                 2.5G  224K  2.5G   1%/dev/shm/dev/sda1              97M   32M   61M  35%/boot/dev/sda6             504M   18M  461M   4%/home/dev/sda3             4.0G  2.5G  1.4G  65%/usr

fdisk-l

 [[email protected] ~]# fdisk-ldisk/dev/sda:107.4 GB, 107374182400 bytes  255 heads, Sectors/track, 13054 cylindersunits = cylinders of 16065 * = 8225280 bytessector size (logical/ph      ysical): bytes/512 bytesi/o size (minimum/optimal): bytes/512 bytesdisk identifier:0x000f0739 Device Boot Start End Blocks Id system/dev/sda1 * 1 102400 linuxpartition 1 Doe        s not end on cylinder boundary./dev/sda2 5235 41943040 linux/dev/sda3 5235        5757 4194304 linux/dev/sda4 5757 13055 58616832 5 extended/dev/sda5 5757 6280 4194304 swap/solaris/dev/sda6 6280 6345 524288 ;p rotected] ~]# fdisk-l | grep diskdisk/dev/sda:107.4 GB, 107374182400 bytesdisk identifier:0x000f0739[[email protected] ~]# 

Iostat view hard disk read and write speed

[Email protected] ~]# IOSTAT-T 1 3//1s once, view 3 timesLinux 2.6.32-358.el6.x86_64 (twj.baidu.com) June 07, 2016 _x86_64_ (4 CPU) June 07, 2016 20:40 03 seconds avg-cpu:%user%nice%syste M%iowait%steal%idle 0.17 0.06 0.74 0.84 0.00 98.19device:tps blk_read/s Blk_ WRTN/S blk_read blk_wrtnsda 8.34 273.82 136.61 1216528 6,069,042,016 June 07 20:40 04 seconds Avg            -CPU:%user%nice%system%iowait%steal%idle 0.00 2.10 9.97 13.12 0.00 74.80Device: TPS blk_read/s blk_wrtn/s blk_read blk_wrtnsda 89.00 3472.00 11208.00 3472 11    2,082,016 year June 07 20:40 05 seconds avg-cpu:%user%nice%system%iowait%steal%idle 0.00 1.99 14.35 9.05      0.00 74.61device:tps blk_read/s blk_wrtn/s blk_read blk_wrtnsda 66.13 1464.52 9800.00 1816 12152

Common commands for viewing system information in Linux