Common Query command collation under Linux centos6.x

Linux centos6.x Common Query command collation----1. System basic Information----View System version

cat /etc/redhat-release[[email protected] ~]# cat /etc/redhat-releaseCentOS release 6.9 (Final)

View Processor Architecture

arch 或 uname -m[[email protected] ~]# archx86_64[[email protected] ~]# uname -mx86_64

View Kernel version

uname -r 或 cat /proc/version[[email protected] ~]# uname -r2.6.32-696.23.1.el6.x86_64[[email protected] ~]# cat /proc/versionLinux version 2.6.32-696.23.1.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-18) (GCC) ) #1 SMP Tue Mar 13 22:44:18 UTC 2018

viewing system Information

uname -a[[email protected] ~]# uname -aLinux test 2.6.32-696.23.1.el6.x86_64 #1 SMP Tue Mar 13 22:44:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

View system time

date[[email protected] ~]# dateThu Apr  5 16:06:07 CST 2018

----2. User-related Information----view Current user

whoami[[email protected] ~]# whoamiroot

View currently logged in System user

w[[email protected] ~]# w15:50:09 up 22:04,  1 user,  load average: 0.00, 0.00, 0.00USER    TTY      FROM              [email protected]  IDLE  JCPU  PCPU WHATroot    pts/0    255.255.255.255  15:37    0.00s  0.00s  0.00s w

View user Information

cat /etc/passwd[[email protected] ~]# cat /etc/passwdroot:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/nologin

View User group information

cat /etc/group[[email protected] ~]# cat /etc/grouproot:x:0:bin:x:1:bin,daemon

----3. Hardware + performance-related----View CPU information

cat /proc/cpuinfo[[email protected] ~]# cat /proc/cpuinfoprocessor      : 0vendor_id      : GenuineIntelcpu family      : 6model          : 79model name      : Intel(R) Xeon(R) CPU E5-2682 v4 @ 2.50GHz......

View memory Information

cat /proc/meminfo[[email protected] ~]# cat /proc/meminfoMemTotal:        2054152 kBMemFree:        1638884 kBBuffers:          31096 kBCached:          302444 kBSwapCached:            0 kB......

View CPU memory updates every five seconds

vmstat 5[[email protected] ~]# vmstat 5procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----r  b  swpd  free  buff  cache  si  so    bi    bo  in  cs us sy id wa st0  0      0 1638884  31112 302536    0    0    3    3  68  157  0  0 100  0  00  0      0 1638728  31112 302556    0    0    0    0  79  168  0  0 100  0  00  0      0 1638728  31120 302556    0    0    0    2  86  176  0  0 100  0  00  0      0 1638728  31120 302556    0    0    0    0  79  167  0  0 100  0  0

View disk space remaining

df -h[[email protected] ~]# df -hFilesystem      Size  Used Avail Use% Mounted on/dev/vda1        40G  1.6G  36G  5% /tmpfs          939M    0  939M  0% /dev/shm

View disk remaining Inodes node

df -i[[email protected] ~]# df -iFilesystem      Inodes IUsed  IFree IUse% Mounted on/dev/vda1      2621440 62268 2559172    3% /tmpfs          240257    1  240256    1% /dev/shm

View System Average Load

cat /proc/loadavg1、5、15分钟内的平均进程数、正在运行的进程数/进程总数、最近运行的进程ID号[[email protected] ~]# cat /proc/loadavg0.00 0.00 0.00 1/103 9728

View system run time + load

uptime[[email protected] ~]# uptime16:01:41 up 22:15,  1 user,  load average: 0.00, 0.00, 0.00

Network Status View

// 查看 指定端口netstat -nlpt | grep 22[[email protected] test]# netstat -nlpt | grep 22tcp        0      0 0.0.0.0:22                  0.0.0.0:*                  LISTEN      1245/sshd// 查看当前tcp连接数(ESTABLISHED)netstat -nat | grep ESTABLISHED|wc -l[[email protected] test]# netstat -nat | grep ESTABLISHED|wc -l2// 查看当前tcp连接数(TIME_WAIT)netstat -na  | grep ‘TIME_WAIT‘ |wc -l[[email protected] test]# netstat -na  | grep ‘TIME_WAIT‘ |wc -l0//  查看当前tcp连接数(指定端口)netstat -nat | grep -i "22"|wc -l[[email protected] test]# netstat -nat | grep -i "22"|wc -l2

----4. Service-related----system performance-top

Top[[email protected] ~]# toptop-16:11:31 up 22:25, 1 user, Load average:0.00, 0.00, 0.00tasks:76 total, 1 ru Nning, sleeping, 0 stopped, 0 zombiecpu (s): 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%stme   m:2054152k Total, 417164k used, 1636988k free, 31384k buffersswap:0k total, 0k used, 0k free,                                                                                                                                                                303324k cached PID USER PR NI VIRT RES SHR S%cpu%MEM time+ COMMAND                                                                                                                                                                      1168 Root 0 125m 12m 8588 S 0.0 0.6 2:31.16 Aliyundun 967                                                                                       7 Root 0 100m 4464 3424 S 0.0 0.2 0:00.04 sshd                                                                                     1364 postfix 0 81200 3516 2632 S     0.0 0.2 0:00.04 Qmgr

System operating conditions-htop

htop需 yum install htop[[email protected] ~]# htop  CPU[                                                                                                        0.0%]    Tasks: 25, 27 thr; 1 running  Mem[|||||##****************                                                                            81/2006MB]    Load average: 0.00 0.00 0.00   Swp[                                                                                                      0/0MB]    Uptime: 22:26:59  PID USER      PRI  NI  VIRT  RES  SHR S CPU% MEM%  TIME+  Command                                                                                                                                                                      1168 root      20  0  125M 12832  8588 S  0.3  0.6  2:31.33 /usr/local/aegis/aegis_client/aegis_10_41/AliYunDun    

View the specified process

ps -ef | grep 进程名[[email protected] ~]# ps -ef | grep sshdroot      1245    1  0 Apr04 ?        00:00:00 /usr/sbin/sshdroot      9677  1245  0 15:37 ?        

View service Status

chkconfig --list[[email protected] ~]# chkconfig --listaegis          0:off  1:off  2:on    3:on    4:on    5:on    6:offagentwatch      0:off  1:off  2:on    3:on    4:on    5:on    6:offaliyun-util    0:off  1:off  2:on    3:on    4:on    5:on    6:off

----5. Log related----View the commands that the current user has executed

history[[email protected] ~]# history    1  ls    2  clear    3  history

View the last 5 lines of system logs

dmesg | tail -n5[[email protected] ~]# dmesg | tail -n5  alloc irq_desc for 30 on node -1  alloc kstat_irqs on node -1virtio-pci 0000:00:04.0: irq 30 for MSI/MSI-XIPv6: Loaded, but administratively disabled, reboot required to enabletype=1305 audit(1522835175.952:3): audit_pid=1031 old=0 auid=4294967295 ses=4294967295 res=1

----6. FILE-related----show total file size per file size

ll -ht[[email protected] test]# ll -httotal 12K-rw-r--r-- 1 root root 19 Apr  5 09:48 1.txt-rw-r--r-- 1 root root  1 Apr  4 17:56 3.png-rw-r--r-- 1 root root  1 Apr  4 17:56 2.png

Tail viewing files

 // 显示最后20行tail -n 20 error.log // 时时刷新日志显示tail -f access.log

Global Find File

find / -name 1.txt[[email protected] test]# find / -name 1.txt/usr/local/src/test/1.txt

Common Query command collation under Linux centos6.x