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Problem:

1. When using a Linux machine, it is often necessary to confirm the current operating system version information, kernel information, etc.

The version information of the operating system can be accomplished by the following commands, such as: Lsb_release-a;cat/etc/issue

The view kernel version can be done by the following command, for example: Uname-a;cat/proc/version,

These commands are more difficult to remember, and this article attempts to explain the origins of these command names to facilitate memory.

Workaround: 1. To view the operating system version of the command 1.1 command lsb_release-a

Lsb_release provides information about specific LSB (Linux standard Base) and release versions.

The results of running lsb_release-a in Ubuntu are as follows:

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1. [Email protected]:~$ lsb_release-a
2. No LSB modules is available.
3. Distributor Id:ubuntu
4. Description:ubuntu 11.10
5. release:11.10
6. Codename:oneiric
7. [Email protected]:~$

1.2 Command Cat/etc/issue

The/etc directory is decentralized with the system configuration file.

/etc/issue files usually include a short description of the system or welcome information. The content is determined by the system administrator.

The results of the Execute cat/etc/issue command in Ubuntu are as follows:

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1. [Email protected]:~$ cat/etc/issue
2. Ubuntu 11.10 \ \l
4. [Email protected]:~$

2. View the kernel version of the command 2.1 command uname-a

Uname from Utsname, is a system call, formatted as

int uret = uname ((struct utsname) * uname_buf),

Among them, the structure pointer uname_buf mainly holds the operating system name, kernel version and hardware architecture;

struct struct utsname is defined as follows:

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2. struct Utsname {
4. Char sysname[]; /* Operating system name (e.g., "Linux") */
6. Char nodename[]; /* Name within "some implementation-defined
8. Network "*/
10. Char release[]; /* OS release (e.g., "2.6.28") */
12. Char version[]; /* OS version */
14. Char machine[]; /* Hardware identifier */
16. #ifdef _gnu_source
18. Char domainname[]; /* NIS or YP domain name */
20. #endif
22. };

The UTS in Utsname refers to the Universal time–sharing system (Universal Time-sharing systems).

The results of running uname-a in Ubuntu are as follows:

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1. [Email protected]:~$ uname-a
2. Linux david-nb 3.0.0-32-generic #51-ubuntu SMP Thu Mar 15:51:26 UTC-i686 i686 i386 Gnu/linux
3. [Email protected]:~$

The kernel version is: 3.0.0-32-generic

2.2 Command Cat/proc/version

The proc file system is a virtual file system that allows you to communicate in Linux kernel space and user space using a new method.

Unlike normal files, these virtual files are created dynamically.

/proc is very powerful, as shown below as the result of performing an interactive query on some elements in the/proc:

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2. [Email protected]:~$ Ls/proc
4. 1 1279 1480 1512 1576 1646 1803 $3081 565 902 buddyinfo FB Loadavg SCSI Version_signature
6. 1001 1485 1515 1580 1649 1807 2052 265 3082 6 903 bus filesystems Locks Self Vmallocinfo
8. 1005 1362 1487 1523 1584 1655 1815 2095 3084 7 904 cgroups FS Mdstat Slabinf o Vmstat
10. 1006  1370  1492  1526  1585  1656  1816  21    2744  3085  754  914     cmdline      interrupts     meminfo       softirq S Zoneinfo
12. 1007  1390  1493  1527  1589  1666  1817  216   2796  318   806  915     consoles     iomem          misc          stat
14. 1013 1496 1539 1671 1828 217-323 837 933 Cpuinfo ioports modules swaps
16. 1030 1409 1542 1616 1673 183 2856 PNS 838 942 crypto IRQ Mounts SYS
18. 1073  1418  1501  1544  1617  1676  188   2391  2881  40    844  977     devices      kallsyms       mtd           sysrq-t Rigger
20. 1079 1448 1503 1548 1619 from 847 982 device-tree Kcore mtrr SYSVIPC
22. 1084  1453  1506  1555  1622  1711  190   2448  2998  453   848  991     diskstats    key-users      net           timer_l Ist
24. 1456 1508 1562 1623 1712 1957 3 455 882 992 DMA kmsg pagetypeinfo timer_s Tats
26. 1168  1457  1509  1563  1625  1776  1992  2538  3017  528   885  994     dri          kpagecount     partitions    tty
28. 1175  1459  1510  1566  1627  1790  1997  2548  3070  531   899  acpi    driver       kpageflags     sched_debug   uptime
30. 1464 1511 1569 1633 2 3080 540 9 Asound execdomains latency_stats schedstat version
32. [Email protected]:~$

Where the version file stores information such as kernel versions, operating system names, and so on, the content of the uname-a is basically the same.

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1. [Email protected]:~$ cat/proc/version
2. Linux version 3.0.0-32-generic ([email protected]) (GCC version 4.6.1 (Ubuntu/linaro 4.6.1-9ubuntu3)) #51-ubuntu SMP Thu Mar 15:51:26 UTC 2013
3. [Email protected]:~$

Kernel version is 3.0.0-32-generic

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