Linuxtipstricks – Just another /linux/blog

June 6, 2009

How to find my pc IP address – aka – what is my IP?

Filed under: user tipstricks — Antonio Portuesi @ 7:27 pm
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Your computer (PC, MAC, handeld and so on…equipped with Windows, Linux, MacOS, every distro/release OS) has an Internal IP address and an External IP address.
It may have been set manually or it may have been set automatically. That doesn’t matter.
Regardless of how it was set there are times when you need to know what that IP address is.
In other words you ask to yourself: How can I find my pc IP?
The easiest way is to go to www.mypcip.net and check out the result in the top of page.
There you can also find some useful information about IT (IP, DNS, WHOIS, MAC, IPv4/6 and counting)

The easier, the better!

December 13, 2008

How to find out who has a file open in Linux

Filed under: user tipstricks — Antonio Portuesi @ 1:28 pm
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How often do mounts and umounts operations fail because you cannot determine who or what is using that device? How many times can you not eject a DVD because someone or something has it still open? How many times have you experienced a file manager that keeps a directory open even after you have navigated out of that directory and clicked the refresh button several times?

Let’s use the fuser tool to find out soething useful for our purpose.

Example 1:

user@pc:~$ fuser -mu /home

/home:                5525c(user)  5601m(user)  5607c(user)  5614c(user)  5685c(user)  5739c(user)  5740c(user)  5742c(user)  5743cm(user)  5744cm(user)  5766m(user)  5778m(user)  5789c(user)  5795c(user)  5799c(user)  5801c(user)  5803cm(user)  5805cm(user)  5806m(user)  5921m(user)  6001cm(user)  6005cm(user)  6076(user)  9391cm(user)  9395c(user)

Example 2:

user@pc:~$ fuser -mu /media

/media:               5514rce(user)  5525re(user)  5586rce(user)  5587rce(user)  5593rce(user)  5595rce(user)  5601rce(user)  5604rce(user)  5607re(user)  5613rce(user)  5614re(user)  5617rce(user)  5685re(user)  5738rce(user)  5739re(user)  5740re(user)  5742re(user)  5743re(user)  5744re(user)  5747rce(user)  5757rce(user)  5759rce(user)  5762rce(user)  5766rce(user)  5772rce(user)  5778rce(user)  5789re(user)  5795re(user)  5799re(user)  5801re(user)  5803re(user)  5805re(user)  5806rce(user)  5811rce(user)  5921rce(user)  6001re(user)  6005re(user)  6032rce(user)  6071rce(user)  6076rce(user)  8712rce(user)  9391re(user)  9395re(user)

Now you get the owner and the related process id. For rurther information about a listed process you can research deeper using ps ax.

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