1: cpu [root @ srv/] # more/proc/cpuinfo | grep & quot; modelname: Intel (R) Xeon (R) CPUX3220@2.40GHzmodelname: Intel (R) xeon (R) CPUX3220@2.40GHz
I. cpu
[Root @ srv/] # more/proc/cpuinfo | grep "model name"
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
[Root @ srv/] # grep "model name"/proc/cpuinfo
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Model name: Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
[Root @ srv/] # grep "model name"/proc/cpuinfo | cut-f2-d:
Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
Intel (R) Xeon (R) CPU X3220 @ 2.40 GHz
II. memory
[Root @ srv/] # grep MemTotal/proc/meminfo
MemTotal: 614400 kB
[Root @ srv/] # free-m
Total used free shared buffers cached
Mem: 600 23 576 0 0 0
-/+ Buffers/cache: 23 576
Swap: 0 0 0
[Root @ srv/] # free-m | grep "Mem" | awk '{print $2 }'
600
3. view the number of CPU bits (32 or 64)
[Root @ srv/] # getconf LONG_BIT
32
4. view the linux version
[Root @ srv/] # more/etc/redhat-release
CentOS release 5 (Final)
[Root @ srv/] # more/etc/issue
CentOS release 5 (Final)
Kernel \ r on an \ m
[Root @ srv/] # more/proc/version
Linux version 2.6.18-92.1.18.el5.028stab060.2PAE ([email = root @ rhel5-32-build-xemul] root @ rhel5-32-build-xemul [/email]) (gc
C version 4.1.2 20071124 (Red Hat 4.1.2-42) #1 SMP Tue Jan 13 12:31:30 MSK 2009
V. view the kernel version
[Root @ srv/] # uname-r
2.6.18-92.1.18.el5.028stab060.2PAE
[Root @ srv/] # uname-
Linux srv.eddiechen.cn 2.6.18-92.1.18.el5.028stab060.2PAE #1 SMP Tue Jan 13 12:31:30 MSK 2009 i686 i686 i386 GNU/Linux
VI. view the time zone
[Root @ srv/] # date-R
Wed, 25 Feb 2009 02:20:50 + 0000
[Root @ srv/] # mv/etc/localtime. save
[Root @ srv/] # cp/usr/share/zoneinfo/Asia/Shanghai/etc/localtime
[Root @ srv/] # date-R
Wed, 25 Feb 2009 10:24:26 + 0800
7. host name
View host name
[Root @ srv/] # hostname
Www.ifuoo.com
Modify host name
[Root @ srv/] # cat/etc/sysconfig/network
8. View selinux information
[Root @ srv/] # sestatus
SELinux status: disabled
9. Network
IP
[Root @ srv/] # ifconfig | grep 'inet addr: '| grep-v' 127. 0.0.1' | cut-d:-f2 | awk '{print $1 }'
207.154.202.216
Gateway
[Root @ srv/] # cat/etc/sysconfig/network
NETWORKING = "yes"
GATEWAY = "192.0.2.1"
HOSTNAME = "srv.eddiechen.cn"
Dns
[Root @ srv/] # cat/etc/resolv. conf
Nameserver 208.74.168.131
Nameserver 208.74.168.132
Nameserver 4.2.2.1
Modify the Host file
[Root @ srv/] # cat/etc/hosts
10. installed software packages
[Root @ srv/] # rpm-qa | wc-l
197
[Root @ srv/] # yum list installed | wc-l
198
11: disks and partitions
[Root @ srv/] # df-h
Filesystem Size Used Avail Use % Mounted on
/Dev/simfs 10G 353 M 9.7G 4%/
[Root @ srv/] # du-sh
353 M
[Root @ srv/] # du/etc-sh
4.6 M/etc
9. view the keyboard layout
Cat/etc/sysconfig/keyboard
Cat/etc/sysconfig/keyboard | grep KEYTABLE | cut-f2-d =
12: view the default language
Echo $ LANG $ LANGUAGE
Cat/etc/sysconfig/i18n
========================================
Http://hi.baidu.com/mypc007
Run the following command to view the physical memory size of the RS/6000 system.
Lsdev-Cc memory
View the physical memory device configured in RS/6000. The following is an example output:
Mem0 Available 00-00 Memory
L2cache0 Available 00-00 L2 Cache
Then use the command
Lsattr-El mem0
Output:
Size 512 Total amount of physical memory in Mbytes False
Goodsize 512 Amount of usable physical memory in Mbytes False
In this example, the physical memory of the machine is 512 MB. If there is mem1 in the output of lsdev, run the same command to view the corresponding size and push it accordingly. L2cache0 is the device name of Level 2 Cache. Similarly, run the following command:
Lsattr-El L2cache0
You can view its size.
View LINUX system digits
1. programming implementation:
Return the value of sizeof (int) in the program. The Returned result is the number of bytes in the operating system. If 4 is returned, it is a 32-bit operating system, and 8 is 64-bit.
2. getconf command:
The getconf command can obtain basic system configuration information, such as the number of operating systems, memory size, and disk size.
For example:
Determine the disk hdisk0 size. if it is a root user, enter:
Getconf DISK_SIZE/dev/hdisk0
Determine the actual memory size: getconf REAL_MEMORY
Determine whether the hardware of the machine is 32-bit or 64-bit: getconf HARDWARE_BITMODE
Determine whether the kernel is 32-bit or 64-bit: getconf KERNEL_BITMODE
If the above getconf KERNEL_BITMODE method fails (it fails on my machine), it may be because the version is inconsistent. try again: getconf WORD_BIT. this command returns the length of the int type, consistent with sizeof (int.