A Linux administrator is troubleshooting a log-rotation problem and needs to list every process that currently has any file open somewhere beneath the directory tree /var/log (including all nested subdirectories). Which lsof command will provide exactly that information?
lsof /var/log
lsof +D /var/log
lsof +d /var/log
lsof -i /var/log
The +D option tells lsof to perform a full recursive descent into the specified directory tree and list any open file it encounters below that point. The similar +d option searches only the named directory's top level and does not descend. Supplying the pathname without either option matches only the exact file or directory itself, and the -i option filters by network sockets and ignores positional pathnames. Therefore, only the command that uses lsof +D /var/log satisfies the requirement to include every open file in /var/log and all of its subdirectories.
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