Common commands for viewing system information in Linux

Source: Internet
Author: User

Common commands for viewing system information in Linux
GuideLinux is a magical and efficient operating system. After learning about Linux, you need to understand these useful commands for viewing system information.View System Version commandsUname

When talking about the system version, you will surely think of uname to view the system kernel version.

Uname-Parameter

Other-n-m-r parameters are ignored.

[root@linuxprobe ~]#uname -aLinux linuxprobe.com 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux[root@linuxprobe ~]#

Uname seems to have seen a lot of information, but it does not seem to be what I want. No System Version

Lsb_release-
[root@linuxprobe ~]# lsb_release -aLSB Version: :base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarchDistributor ID: RedHatEnterpriseServerDescription: Red Hat Enterprise Linux Server release 6.4 (Santiago)Release: 6.4Codename: Santiago[root@linuxprobe ~]#
Cat/etc/issue
[root@linuxprobe ~]#cat /etc/issueRed Hat Enterprise Linux Server release 6.4 (Santiago)Kernel \r on an \m[root@linuxprobe ~]#
View memory problemsFree

When talking about Linux memory, I think of a command free, which is explained in the Linux commands that beginners must master in Chapter 1 of the textbook.

[root@linuxprobe ~]# free             total       used       free     shared    buffers     cachedMem:       5228872     669360    4559512          0      28060     266936-/+ buffers/cache:     374364    4854508Swap:      4194296          0    4194296[root@linuxprobe ~]# free -m             total       used       free     shared    buffers     cachedMem:          5106        653       4452          0         27        260-/+ buffers/cache:        365       4740Swap:         4095          0       4095[root@linuxprobe ~]# free -g             total       used       free     shared    buffers     cachedMem:             4          0          4          0          0          0-/+ buffers/cache:          0          4Swap:            3          0          3[root@linuxprobe ~]# 

Obviously, the memory size, usage, remaining amount, buffers and cached values, and swap conditions are clear at a glance. The unit can be specified using the-m/-g parameter.

View cpu ProblemsUptime
[Root @ linuxprobe ~] # Uptime 20:09:48 up 43 min, 3 users, load average: 0.35, 0.25, 0.11 // average system load, 1 minute, 5 minutes, 15 minutes
Top

The cpu and memory of the real-time monitoring system are refreshed once every 3 seconds by default.

[root@linuxprobe ~]# toptop - 20:15:41 up 49 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:   5228872k 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 1536 1224 S  0.0  0.0   0:05.37 init                             2 root      20   0     0    0    0 S  0.0  0.0   0:00.02 kthreadd                         3 root      RT   0     0    0    0 S  0.0  0.0   0:00.07 migration/0                      4 root      20   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      20   0     0    0    0 S  0.0  0.0   0:00.10 ksoftirqd/1                     10 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 watchdog/1                      11 root      RT   0     0    0    0 S  0.0  0.0   0:00.10 migration/2                     12 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/2                     13 root      20   0     0    0    0 S  0.0  0.0   0:00.01 ksoftirqd/2                     14 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 watchdog/2                      15 root      RT   0     0    0    0 S  0.0  0.0   0:00.17 migration/3                     16 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/3                     17 root      20   0     0    0    0 S  0.0  0.0   0:00.06 ksoftirqd/3                     18 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 watchdog/3                      19 root      20   0     0    0    0 S  0.0  0.0   0:00.41 events/0  

Cpu memory real-time usage as the standard

View cpu parameters -- file:/proc/cpuinfo
[Root @ linuxprobe ~] # Cat/proc/cpuinfo | grep "physical id" | uniq | wc-l2 // Number of CPUs [root @ linuxprobe ~] # Cat/proc/cpuinfo | grep "cpu cores" | uniqcpu cores: 2 // Number of threads [root @ linuxprobe ~] # Cat/proc/cpuinfo | grep 'model name' | uniqmodel name: Intel (R) Core (TM) i5-3230M CPU @ 2.60 GHz // cpu model Parameters
View hard disk ProblemsDf
[Root @ linuxprobe ~] # Df file system 1 K-block used available % mount point/dev/sda2 41284928 469040 38718736 2%/tmpfs 2614436 224 2614212 1% 99150/dev/shm/dev/sda1 32504 61526 35% /boot/dev/sda6 516040 18016 471812 4%/home/dev/sda3 4128448 2542976 1375760 65%/usr [root @ linuxprobe ~] # Df-h // display the file system capacity in use in a simple and understandable way % mount point/dev/sda2 40G 459 M 37G 2%/tmpfs 2.5G 224 K 2.5G 1%/dev/shm/dev/sda1 97 M 32 M 61 M 35%/boot/dev/sda6 504 M 18 M 461 M 4%/home/dev/sda3 4.0G 2.5G 1.4G 65%/usr
Fdisk-l
[root@linuxprobe ~]# fdisk -lDisk /dev/sda: 107.4 GB, 107374182400 bytes255 heads, 63 sectors/track, 13054 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisk identifier: 0x000f0739   Device Boot      Start         End      Blocks   Id  System/dev/sda1   *           1          13      102400   83  LinuxPartition 1 does not end on cylinder boundary./dev/sda2              13        5235    41943040   83  Linux/dev/sda3            5235        5757     4194304   83  Linux/dev/sda4            5757       13055    58616832    5  Extended/dev/sda5            5757        6280     4194304   82  Linux swap / Solaris/dev/sda6            6280        6345      524288   83  Linux[root@linuxprobe ~]#  fdisk -l | grep DiskDisk /dev/sda: 107.4 GB, 107374182400 bytesDisk identifier: 0x000f0739[root@linuxprobe ~]# 
Iostat view hard disk read/write speed
[Root @ linuxprobe ~] # Iostat-t 1 3 // 1 s, check 3 times Linux 2.6.32-358. el6.x86 _ 64 (twj.baidu.com) February 12 _ x86_64 _ (4 CPU) February 20: 40 minutes 03 seconds avg-cpu: % user % nice % system % iowait % steal % idle 0.17 0.06 0.74 0.84 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtnsda 8.34 273.82 136.61 1216528 6069042016--May 23, 04 seconds avg-cpu: % user % nice % system % iowait % steal % idle 0.00 2.10 9.97 13.12 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtnsda 89.00 3472.00 11208.00 3472 112082016 at 20 o'clock on January 1, June 07 minutes avg-cpu: % user % nice % system % iowait % steal % idle 0.00 1.99 14.35 9.05 0.00 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtnsda 74.61 66.13 1464.52 9800.00

Address: http://www.linuxprobe.com/linux-cat-system.html


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