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How do I find the version of a kernel module (*.ko files located in /lib/modules/... directory) in Linux server?
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How do I find out BIOS version using a Linux command line option?
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Q. I've couple of Linux / Windows server hosted in remote data center? My ISP provides following option for rebooting the box:
a) Graceful shutdown command
b) An IPMI reboot
c) A power strip

Which one is the best way to reboot server and why?
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Linux list all IROs currently in use

Q. How do I list all IRQs currently used under CentOS Linux?

A.. There is a file called /proc/interrupts. The proc filesystem is a pseudo filesystem which is used as an interface to kernel data structures. It is commonly mounted at /proc.

This is used to record the number of interrupts per each IRQ on (at least) the i386 architecture. Very easy to read formatting, done in ASCII.

Display /proc/interrupts

Use cat or less command:
$ cat /proc/interrupts
Output:

           CPU0       CPU1       CPU2       CPU3
  0:        187          0          0          0   IO-APIC-edge      timer
  1:      39922          0          0          0   IO-APIC-edge      i8042
  7:          0          0          0          0   IO-APIC-edge      parport0
  8:          4          0          0          0   IO-APIC-edge      rtc
  9:          1          0          0          0   IO-APIC-fasteoi   acpi
 12:     846774          0          0          0   IO-APIC-edge      i8042
 14:     105048          0          0          0   IO-APIC-edge      libata
 15:          0          0          0          0   IO-APIC-edge      libata
 16:    1069722          0          0          0   IO-APIC-fasteoi   libata, uhci_hcd:usb4, nvidia
 17:     105382          0          0          0   IO-APIC-fasteoi   eth0
 18:      83040          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb2, libata
 19:          0          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb1, ehci_hcd:usb5
 20:     474168          0          0          0   IO-APIC-fasteoi   uhci_hcd:usb3, ohci1394, ra0
 21:      10117          0          0          0   IO-APIC-fasteoi   bttv0
 22:     594327          0          0          0   IO-APIC-fasteoi   HDA Intel
NMI:          0          0          0          0
LOC:    1754492    1545836    2085855    1878596
ERR:          0
MIS:          0

You need to use command called lsdev. It gathers information about your computer's installed hardware from the interrupts, ioports and dma files in the /proc directory, thus giving you a quick overview of which hardware uses what I/O addresses and what IRQ and DMA channels.

This command is very useful while troubleshooting various hardware conflict problems.

Task display : CPU Information

$ cat /proc/cpuinfo

Task: Display Free and used Memory Information

$ free -m

Task: Display partition information

# fdisk -l

Task: Display file system disk space usage

# df -H
OR
# df -h

Task: Estimate file space usage

# du

Task: List PCI devices

# lspci

Task: List USB devices

# lsusb

Task display : More Information

$ lsdev

Output:

Device            DMA   IRQ  I/O Ports
------------------------------------------------
0000:00:1d.0                 d800-d81f
0000:00:1d.1                 d000-d01f
0000:00:1d.2                 d400-d41f
0000:00:1f.0                 4000-407f 4080-40bf
0000:00:1f.1                 f000-f00f
0000:00:1f.3                 5000-501f
0000:00:1f.5                 e000-e0ff e400-e43f
0000:01:05.0                   c000-c0ff
8139too                          c000-c0ff
acpi                      9
bttv0                    22
cascade             4
dma                          0080-008f
dma1                         0000-001f
dma2                         00c0-00df
ehci_hcd:usb4            20
eth0                     18
fpu                          00f0-00ff
GPE0_BLK                       4028-402f
i8042                  1 12
ICH4                     21
ide0                     14  01f0-01f7 03f6-03f6   f000-f007
ide1                     15  0170-0177 0376-0376   f008-f00f
Intel                          e000-e0ff   e400-e43f
keyboard                     0060-006f
parport0                  7  0378-037a
PCI                          0cf8-0cff c000-cfff
pic1                         0020-0021
pic2                         00a0-00a1
PM1a_CNT_BLK                   4004-4005
PM1a_EVT_BLK                   4000-4003
PM_TMR                         4008-400b
rtc                       8  0070-0077
serial                       02f8-02ff 03f8-03ff
timer                     0
timer0                       0040-0043
timer1                       0050-0053
uhci_hcd                       d000-d01f   d400-d41f   d800-d81f
uhci_hcd:usb1            16
uhci_hcd:usb2            19
uhci_hcd:usb3            17
vga+                         03c0-03df

See also: