Continuously monitoring open files in real-time

Recently, I wanted to be able to get a list of files that were being opened by a running process.  Searching all over the web, I found a number of solutions, but they all involved using the lsof command.

The lsof command has many, many options, and it allows you to see which files have been opened by a given process. Coming the other direction, it also allows you to see which process has opened a given file. I can see how it would be extremely useful in many different circumstances.

However, my problem was that my process was opening files and closing them almost immediately. In other words, I had no hope of using the lsof command to view open files, because lsof only shows files that are currently open, and by the time lsof would run, the files were already closed again!

I discovered a different way to continuously monitor, in real-time, all of the files that were being opened by a process, regardless of how quickly they were closed:

strace -tt myprog 2> system_calls.txt
grep 'open(' system_calls.txt > opened_files.txt

strace is a command that logs all of the system calls for myprog.  The -tt option includes a timestamp (with microseconds) at the beginning of each line. Each file is opened with a call to "open(", so grepping for this string should give you a list of all files that were opened.

Installing Ubuntu 10.04 (Lynx) x86_64 Server on Dell XPS 630i

Recently, I needed to install Ubuntu on a Dell XPS 630i.  There was one irritating problem: the installation cd would consistently freeze just after selecting "Install Ubuntu" from the main menu, leaving me with a blinking white cursor and the inner turmoil that can only be experienced while wondering whether your computer is actually doing anything

I've never had these kinds of problems installing Ubuntu before, and I wasn't really sure where to start troubleshooting.  A number of forum websites with postings similar to my own situation recommended changing some of the install parameters, such as noapic, nolapic, noacpi, etc.

None of this worked.

I finally found this post on a Dell community forum, which ingeniously suggested to:

1. Install Ubuntu 8.04 (Heron) x86_64 Server


2. Check for updates in the package manager.  Install all UPDATES (NOT distribution upgrade)


3. Restart


4. In a terminal, sudo update-manager --devel-release


5. Check for updates one more time.  THEN click on the button at the top of the package manager window to install the distribution upgrade to arrive at 10.04 (Lynx).

I never would have thought of that.  I followed the post instructions exactly.  Success!  Everything appears to be working just fine.  Here's to you, jakeman66.