CentOS operating system commonly used commands

A: Using CentOS common command to see cpu

more / proc / cpuinfo | grep "model name"

grep "model name" / proc / cpuinfo

[Root @ localhost /] # grep "CPU" / proc / cpuinfo

model name: Intel (R) Pentium (R) Dual CPU E2180@2.00GHz

model name: Intel (R) Pentium (R) Dual CPU E2180@2.00GHz

If you feel the need to see a more comfortable

grep "model name" / proc / cpuinfo | cut-f2-d:

2: Using CentOS common command to see memory

grep MemTotal / proc / meminfo grep MemTotal / proc / meminfo | cut-f2-d: free-m | grep "Mem" | awk '(print $ 2)'

3: Using CentOS common command to see cpu is 32-bit or 64-bit

View CPU digits (32 or 64)

getconf LONG_BIT

4: Using CentOS common command to see the current version of linux

more / etc / redhat-release

cat / etc / redhat-release

5: Use common command to see the kernel version of CentOS

uname-r

uname-a



6: Using CentOS common command to see the current time

The above date has been how to synchronize time

7: Using CentOS common command to see the hard disk and partition

df-h

fdisk-l

You can also view partition

du-sh

You can see all the space occupied by the

du / etc-sh

You can see the size of this directory

8: Using CentOS common command to see the installed packages

View the system when the installation package to install

cat-n / root / install.log

more / root / install.log | wc-l

See who is already installed package

rpm-qa

rpm-qa | wc-l

yum list installed | wc-l

But very strange, I passed the rpm, and yum install the package in two ways the query, the number not the same. Did not know the cause.

9: Using CentOS common command to see the keyboard layout

cat / etc / sysconfig / keyboard

cat / etc / sysconfig / keyboard | grep KEYTABLE | cut-f2-d =

10: Using CentOS common command to see selinux case

sestatus

sestatus | cut-f2-d:

cat / etc / sysconfig / selinux

11: Using CentOS common command to see the ip, mac address

In ifcfg-eth0 file, you can see mac, gateway and other information. ifconfig cat / etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR cat / etc/sysconfig/network-scripts/ifcfg-eth0 | grep IPADDR | cut-f2-d = ifconfig eth0 | grep "inet addr:" | awk '(print $ 2)' | cut-c 6 - ifconfig | grep 'inet addr:' | grep-v '127 .0.0.1 '| cut-d:-f2 | awk' (print $ 1) 'View the gateway cat / etc / sysconfig / network view dns cat / etc / resolv.conf 12: Using CentOS common command to see the default language

echo $ LANG $ LANGUAGE

cat / etc/sysconfig/i18n

12: Using CentOS common command to see whether the use of their time zone and UTC time

cat / etc / sysconfig / clock



13: Using CentOS common command to see the host name

hostname

cat / etc / sysconfig / network

Modify the host name is to modify this file, while at best the host file also changes.

14: Using CentOS common command to see the boot running time

uptime

09:44:45 up 67 days, 23:32, ...

Segment seems to have really the problem, my machine is 67 days before the boot.

# System resource usage

vmstat 1-S m procs ----------- memory ---------- --- swap - ----- io ---- - system - - ---- cpu ------ rb swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 233 199 778 0 0 4 25 1 1 3 0 96 0 0 0 0 0 233 199 778 0 0 0,010,298,561,318,600