this post was submitted on 09 Sep 2024
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In Unix/Linux, a removed file only disappears when the last file descriptor to it is gone. As long as the file
/usr/bin/rmis still opened by a process (and it is, because it is running) it will not actually be deleted from disk from the perspective of that process.This also why removing a log file that's actively being written to doesn't clear up filesystem space, and why it's more effective to truncate it instead. ( e.g. Run
> /var/log/myhugeactivelogfile.loginstead ofrm /var/log/myhugeactivelogfile.log), or why Linux can upgrade a package that's currently running and the running process will just keep chugging along as the old version, until restarted.Sometimes you can even use this to recover an accidentally deleted file, if it's still held open in a process. You can go to
/proc/$PID/fd, where$PIDis the process ID of the process holding the file open, and find all the file descriptors it has in use, and then copy the lost content from there.