Comments on: Linux: use lsof to find which files are open by a process http://www.rustyrazorblade.com/2008/12/linux-use-lsof-to-find-which-files-are-open-by-a-process/ Tech Thoughts, Mostly on LAMP - by Jon Haddad Thu, 22 Jul 2010 09:10:54 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: jon http://www.rustyrazorblade.com/2008/12/linux-use-lsof-to-find-which-files-are-open-by-a-process/comment-page-1/#comment-33315 jon Wed, 24 Dec 2008 19:13:14 +0000 http://www.rustyrazorblade.com/?p=450#comment-33315 Clearly I should have checked the man page. Thanks for the tip. Clearly I should have checked the man page. Thanks for the tip.

]]> By: Stoner http://www.rustyrazorblade.com/2008/12/linux-use-lsof-to-find-which-files-are-open-by-a-process/comment-page-1/#comment-33307 Stoner Wed, 24 Dec 2008 15:27:08 +0000 http://www.rustyrazorblade.com/?p=450#comment-33307 Instead of listing every open file handle on a system and grepping through it, lsof lets you specify a list of PIDs to show open file handles for. It's the -p parameter. lsof -p Of course, it helps to run this using sudo or as the user running the mysqld process, otherwise you get something like this: [jstoner@mars ~]$ /usr/sbin/lsof -p 1866 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME mysqld 1866 mysql cwd unknown /proc/1866/cwd (readlink: Permission denied) mysqld 1866 mysql rtd unknown /proc/1866/root (readlink: Permission denied) mysqld 1866 mysql txt unknown /proc/1866/exe (readlink: Permission denied) mysqld 1866 mysql NOFD /proc/1866/fd (opendir: Permission denied) Instead of listing every open file handle on a system and grepping through it, lsof lets you specify a list of PIDs to show open file handles for. It’s the -p parameter.

lsof -p

Of course, it helps to run this using sudo or as the user running the mysqld process, otherwise you get something like this:

[jstoner@mars ~]$ /usr/sbin/lsof -p 1866
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
mysqld 1866 mysql cwd unknown /proc/1866/cwd (readlink: Permission denied)
mysqld 1866 mysql rtd unknown /proc/1866/root (readlink: Permission denied)
mysqld 1866 mysql txt unknown /proc/1866/exe (readlink: Permission denied)
mysqld 1866 mysql NOFD /proc/1866/fd (opendir: Permission denied)

]]>