Common but useful query commands in Linux

Article Title: query commands that are not commonly used but are useful in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems and open source, and other basic classification I. Command for viewing system version information
　
Several Methods to view linux version information:
　
1. uname-
　
2. cat/proc/version
　
3. cat/etc/issue
　
4. lsb_release-
　
Details about lsb_release-
　
Log on to the server and execute lsb_release-a to list all version information, for example:
　
1. [root@3.5.5Biz-46 ~] # Lsb_release-
　
2. lsbversion: 1.3
　
3. Distributor ID: RedHatEnterpriseAS
　
4. Description: Red Hat Enterprise Linux AS release 4 (Nahant Update 1)
　
5. Release: 4
　
6. Codename: NahantUpdate1
　
7. [root@3.5.5Biz-46 ~] #
　
This command applies to all linux releases, including Redhat, SuSE, and Debian.
　
Ii. Command for viewing hardware information (Linux & Solaris)
　
Command for viewing hardware information in linux
　
View CPU:
　
Cat/proc/cpuinfo
　
View memory:
　
Cat/proc/meminfo
　
Free
　
View Hard Disk:
　
Df-h-T (no device cannot be seen)
　
Fdisk-l can be viewed in redhat9.0; redhat Enterprise Edition does not work.
　
View IRQ usage
　
Cat/proc/interrupts
　
There are several commands in linux to view the information of many hardware devices.
　
Lspci-v
　
Dmidecode
　
Dmesg
　
Solaris:
　
Nic speed: dmesg | grep link
　
CPU frequency: psrinfo-v or mpstat
　
Cpu/memory, etc.: prtdiag-v (most of the information is listed) needs to first enter/usr/platform/sun4u/sbin
　
Hard Disk: iostat-E
　
Iii. Speed and traffic
　
View traffic:
　
Iptraf