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Top Forums UNIX for Dummies Questions & Answers Is it possible to find out how/when/who deleted particular dierectory on UNIX Aix3 Post 51186 by Perderabo on Wednesday 12th of May 2004 10:29:18 PM
Old 05-12-2004
Yow! First of all, you can do "ps -fu <uid>" to get a list of process for a certain user. But even with that revision, I would certainly not run that script. Especially for root. I don't know AIX, but there are processes like swapper and init that are special. I wouldn't try a ptrace() on them without a lot of research.

Can you briefly unplug the system from the network? If the directory disappears while the box is unplugged from the network, you know that it's a local process. If the directory is exported via NFS or a similiar service the local box may be invoking a rmdir() or unlink(). Even without NFS, a cronjob on another system could use a remote shell. Unplugging the system for a a few carefully timed seconds will tell you if another box is involved.

Deleting a directory requires write permission to the parent directory. By varying the permissions on that parent, you should be able to nail down the uid involved.

I would do a "ps -fu <uid>" in a loop around 4:00, sending the results to a file. Then I would study the file looking for any commands that could delete the directory.


Most directories are deleted by program like rm or rmdir. Or maybe perl. For that to happen, the program must run. To run a program, you must read it. This updates atime in the inode. Run "ls -lu /usr/bin/rm" at 3:59 and 4:01. If the time doesn't change, that was not the program used.

With a little detective work, you can usually zero in on the culprit.
 

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learn(1)						      General Commands Manual							  learn(1)

NAME
learn - Provides computer-aided instruction for the C shell SYNOPSIS
learn [-directory] [subject] [lesson] The learn command provides computer-aided instruction courses and practice in the use of Tru64 UNIX. OPTIONS
Allows you to exercise a script in a nonstandard place. DESCRIPTION
To get started, enter learn; if this is the first time that you are invoking the learn command, you are guided through a series of ques- tions to determine what type of instruction you want to receive. If you have used learn before and left your last session without completing a subject, the program uses information in $HOME/.learnrc to start you up in the same place you left off. To bypass questions, enter a subject or lesson. In order to enter a lesson, you must know the lesson number that you received in a previ- ous learn command session. If you do not know the lesson number, enter the lesson number as a subject. The learn command searches for the first lesson containing the subject you specified. If the lesson is a - (dash), learn prompts for each lesson; this is useful for debug- ging. You can specify the following subjects: files editor vi morefiles macros eqn C SUBCOMMANDS
There are a few special commands. The bye command terminates a learn session, and the where command tells you of your progress (where m tells you more.) The again command redisplays the text of the lesson and again lesson lets you review lesson. The hint command prints the last part of the lesson script used to evaluate a response, while hint m prints the entire lesson script. This is useful for debugging lessons and might possibly give you an idea about what is expected. EXAMPLES
To take the online lesson about files, enter: learn files You are then prompted for further input. FILES
Playpen directories. Start-up information. SEE ALSO
Commands: csh(1), ex(1) learn(1)
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