Aix who is using a file

If, for some reason, you need to know this, you could check every directory within the file system using as many "fuser -c" commands as it took. But, since the user could be currently located in any subdirectory and might move while you are checking, this process could be both slow and problematical. You might try looping through all the subdirectories in the file system using a loop and an embedded find command like that shown below, but you would soon discover that the find command, in accessing each subdirectory, also ends up "using" it and, therefore, reporting itself in the process.

In fact, every directory would be listed in the output of this command. While I don't advocate tossing users off systems without due courtesy, I have often found that users who are keeping a file system busy have been idle for hours. Interestingly, editing a file does not, by itself, keep a file system busy.

The -k option doesn't work on a mount point. Once you identify a process that is using a particular directory or file, you can terminate the process using the kill command. Alternately, if you identify the particular file or directory that is being used, you can use fuser's -k command to kill it. If a file system is busy because of user activity, the most expedient way to make the file system non-busy is to list the processes keeping it busy and terminate each process with a kill In the commands below, I have verified that the user is not actively working before terminating his or her process, but you will have to weigh the interests of your users' processing needs against your need to unmount the file system.

Linux systems also include the fuser command, but with different options than Solaris. If you are administering Linux systems, you should check the man command for the fuser implementation on your system.

Sandra Henry-Stocker has been administering Unix systems for more than 30 years. She describes herself as "USL" Unix as a second language but remembers enough English to write books and buy groceries. She lives in the mountains in Virginia where, when not working with or writing about Unix, she's chasing the bears away from her bird feeders. Have a question or suggestion? Please leave a comment to start the discussion. Please keep in mind that all comments are moderated and your email address will NOT be published.

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