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Top Forums UNIX for Dummies Questions & Answers How to find out who changed the file permission in unix Post 302593420 by jim mcnamara on Thursday 26th of January 2012 10:01:27 PM
Old 01-26-2012
There is NO smoking gun in UNIX without auditing. Period. Frank gave you a way to guess. Guess means just that - take a stab based on circumstantial evidence.
Step 1:
Code:
ls -lc file_in_question

This gives you the exact time of the incident, unless you have already set permissions back to what they are supposed to be.

Assuming this time is really correct try to correlate that with who was logged in at that time. If you are very lucky only one person was logged in. Otherwise you get to guess who did it. How to do this?


Try:
Code:
last | more

This lists who has logged in and when they logged out. Since the the system was rebooted, in the order of newest to oldest. You can see the timestamp on the file, you can see who was connected to the system at that time. That is the best you can do. Right now. Enable auditing. Then you are covered from now on.

Last edited by jim mcnamara; 01-26-2012 at 11:10 PM..
This User Gave Thanks to jim mcnamara For This Post:
 

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RUSERS(1)						    BSD General Commands Manual 						 RUSERS(1)

NAME
rusers -- who is logged in to machines on local network SYNOPSIS
rusers [-al] [host ...] DESCRIPTION
The rusers command produces output similar to who, but for the list of hosts or all machines on the local network. For each host responding to the rusers query, the hostname with the names of the users currently logged on is printed on each line. The rusers command will wait for one minute to catch late responders. The following options are available: -a Print all machines responding even if no one is currently logged in. -l Print a long format listing. This includes the user name, host name, tty that the user is logged in to, the date and time the user logged in, the amount of time since the user typed on the keyboard, and the remote host they logged in from (if applicable). DIAGNOSTICS
rusers: RPC: Program not registered The rpc.rusersd(8) daemon has not been started on the remote host. rusers: RPC: Timed out A communication error occurred. Either the network is excessively congested, or the rpc.rusersd(8) daemon has terminated on the remote host. rusers: RPC: Port mapper failure - RPC: Timed out The remote host is not running the portmapper (see portmap(8) ), and cannot accomodate any RPC-based services. The host may be down. SEE ALSO
rwho(1) users(1), who(1), portmap(8), rpc.rusersd(8) HISTORY
The rusers command appeared in SunOS. BUGS
The sorting options are not implemented. Linux NetKit (0.17) August 15, 1999 Linux NetKit (0.17)
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