0xFE - 11111110b - 0376 - 254 b9#9: Troubleshooting UNIX Systems with Lsof - The Diigo Meta page

• 23 Dec 11
  

  One of the least-talked-about tools in a UNIX sysadmin's toolkit is lsof. Lsof lists information about files opened by processes. But that's really an understatement.
  
  Most people forget that, in UNIX, (almost) everything is a file. The OS makes hardware available to applications by way of files in /dev. Kernel, system, memory, device etc. information in made available inside files in /proc. TCP/UDP sockets are sometimes represented internally as files. Even directories are really just files containing other filenames.
  
  Lsof works by examining kernel data-structures and provides a variety of information related to files, pipes, sockets and more.
  
  Lsof is installed by default on most Linux distributions, BSD distributions and OS X. Binary packages for Solaris, AIX, HP-UX, *cough*SCO OpenServer*cough* and many other UNIXes (Unices?) are available on the web.

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