Linux commands

[1] lsof -i :<port_number> : To find out who is listening to the specified port

jestinjoy@jestin:~$ lsof -i :80


COMMAND    PID      USER           FD   TYPE     DEVICE SIZE NODE NAME
firefox-b         3463     jestinjoy   21u      IPv4     22204               TCP 192.168.1.3:57779->maa03s01-in-f104.1e100.net:www (ESTABLISHED)
firefox-b         3463     jestinjoy   65u      IPv4     22191               TCP 192.168.1.3:60551->maa03s01-in-f100.1e100.net:www (ESTABLISHED)
firefox-b         3463     jestinjoy   66u      IPv4      22246              TCP 192.168.1.3:58349->nuq04s01-in-f113.1e100.net:www (ESTABLISHED)
firefox-b         3463     jestinjoy   77u      IPv4      22713              TCP 192.168.1.3:48887->maa03s01-in-f95.1e100.net:www (ESTABLISHED)


[2]  finger @kernel.org : Gives information about current kernel


jestinjoy@jestin:~$  finger @kernel.org

[kernel.org]
The latest linux-next version of the Linux kernel is:         next-20110506
The latest snapshot 2.6 version of the Linux kernel is:       2.6.39-rc6-git6
The latest mainline 2.6 version of the Linux kernel is:       2.6.39-rc6
The latest stable 2.6.38 version of the Linux kernel is:      2.6.38.5 
The latest stable 2.6.37 version of the Linux kernel is:      2.6.37.6 
The latest stable 2.6.36 version of the Linux kernel is:      2.6.36.4 
The latest longterm 2.6.35 version of the Linux kernel is:    2.6.35.13
The latest stable 2.6.35 version of the Linux kernel is:      2.6.35.9 
The latest longterm 2.6.34 version of the Linux kernel is:    2.6.34.9 
The latest longterm 2.6.33 version of the Linux kernel is:    2.6.33.12
The latest longterm 2.6.32 version of the Linux kernel is:    2.6.32.39
The latest stable 2.6.32 version of the Linux kernel is:      2.6.32.28
The latest longterm 2.6.27 version of the Linux kernel is:    2.6.27.59
The latest stable 2.6.27 version of the Linux kernel is:      2.6.27.57
The latest stable 2.4.37 version of the Linux kernel is:      2.4.37.11

[3] date -s "21 JUL 2011 19:13:00" : Set date and time from command line

# date -s "21 JUL 2011 19:13:00"

Thu Jul 21 19:13:00 IST 2011

[4] getconf PAGESIZE : Gives the page size value

# getconf PAGESIZE

4096








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