To find the kernel version and memory details of LINUX / SOLARIS Operating System

In SOLARIS, uname -r will give you the solaris release level.
some other useful options with uname are


uname -s [Operating system]
SunOS


uname -r [Release version]
5.8

For example if output is:
2.6.22-14-generic

then it denotes:
* 2 : Kernel version
* 6 : The major revision of the kernel
* 22 : The minor revision of the kernel
* 14 : Immediate fixing / bug fixing for critical error
* generic : Distribution specific sting. For example, Redhat appends string such as EL5 to indicate RHEL 5 kernel.


uname -v
Generic_117350-27[OS version]


uname -a
SunOS hostname 5.8 Generic_117350-27 sun4u sparc
The last two words describes h/w name and processor respctl[equivalent to -m and -p),


$ cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5 (Tikanga)
this command return the Centos version


To find the Memory details:

dmesg | grep ^Memory:

Output: Memory: 1734144k/1792092k available (2512k kernel code, 49156k reserved, 1396k data, 184k init)

The second value is the physical RAM size. It'll also tell you what other junk is subtracted from that to give you what you get with "free"..

Source

Changing the dual boot order using the boot.ini or BCDEdit.exe

The primary tool to edit Windows Vista boot configuration is BCDEdit.exe, a tool which is included in Windows Vista distribution in the;

C:\windows\system32 folder 

(C: being the windows vista system drive). 

BCDEdit.exe allows you to change and configure boot application data (files) in the BCD (Boot Configuration Data) stores which replace the settings in the boot.ini file in earlier versions of Windows.

BCDEdit basically replaces the BootCfg.exe tool that was used with earlier versions of Windows. BCDEdit provides much better and wider command line options and can do much more tasks than BCDCfg.

Here’s how you can use BCDedit to change the boot sequence and display order in the boot menu.

1. Start > Cmd > Right Click cmd> Run as Administrator

2. At the command prompt :

a. C:\> cd windows/system32

b. C:\windows\system32> bcdedit /?

c. C:\windows\system32> bcdedit /enum all

d. The output displays the boot configuration data of all the operating systems on the computer:

Windows Boot Loader

identifier {current}

device partition=C:

path \Windows\system32\winload.exe

description Microsoft Windows Vista

locale en-US

inherit {bootloadersettings}

recoverysequence {572bcd56-ffa7-11d9-aae0-007e994107d}

recoveryenabled Yes

osdevice partition=C:

systemroot \Windows

resumeobject {89b97029-9609-11db-bbfe-cfc7153012f0}

nx OptIn

e. Note the 128-bit GUID of the Windows XP system. You will have a similar entry for that.

f. C:\Windows\system32> bcdedit /default

E.g bcdedit /default {cbd971bf-b7b8-4885-951a-fa03044f5d71}

Where {cbd971bf-b7b8-4885-951a-fa03044f5d71} is the GUID of the Windows XP system.

In case you wish to delete the Windows XP entry from the boot menu:

g. c:\windows\system32> bcdedit /delete

You can also change the description of an entry using the following command:

h. Bcdedit /set ID description "The new description"


For example:

bcdedit /set {802d5e32-0784-11da-bd33-000476eba25f} description "My Favorite OS"

You can change the display order of the boot options using the following command:

i. bcdedit /displayorder ID1 [ID2] [ID3] [...]

For example :

bcdedit /displayorder {802d5e32-0784-11da-bd33-000476eba25f}

{cbd971bf-b7b8-4885-951a-fa03044f5d71}

This will change the diplay order of the entries the next time the system is turned on only.

In order to make permanant changes to the boot order you can use the following command:

j. bcdedit /bootsequence ID1 [ID2] [ID3] ...

For example:

bcdedit /bootsequence {802d5e32-0784-11da-bd33-000476eba25f}

{cbd971bf-b7b8-4885-951a-fa03044f5d71}

The following command sets the boot manager’s timeout to 30 seconds:

k. Bcdedit /timeout 30

Download a complete guide on BCD edit here!!