> For the complete documentation index, see [llms.txt](https://fashaun.gitbook.io/linux_note/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://fashaun.gitbook.io/linux_note/third_chapter.md).

# Third Chapter

Show all interrupt and its IRQ\_NO on cpu

* $(cat /proc/interrupts)

  Check interrupt no. (Each registered interrut will have a no.)
* $(/proc/irq/$IRQ\_NO)

Check cpu information

* $(/proc/cpuinfo)

Check system uptime (output: second)

* $(/proc/uptime)