Recently I encountered a situation, in which I need to list open files under a directory. I searched the quick start tutorials of lsof command and found a few useful snippet. I posted them here.
1. List open file or directory using its path.
lsof /path/to/the/file/or/directory
2. List open files or directories under the top-most level of a directory
lsof +d /path/to/the/directory
Note: This also includes the top-most directory itself.
3. List open files recursively under a directory
lsof +D /path/to/the/directory
Note: This also includes the top-most directory itself.
4. List open files opened by a particular process
lsof -p pid
5. List open files owned by a particular user
lsof -u user
6. List open files matching two or mare criterias
lsof -a -u user -p pid
7. List open files, which has a link count less than a value
lsof +L 8
The above commands except the last one cover most of the use cases in our daily work. I will write another post about the last one in the future. In fact, this post is triggered by the last command, which can demystify the abnormal output of the df command.