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Full Discussion: How to find out who changed the file permission in unix
Top Forums UNIX for Dummies Questions & Answers How to find out who changed the file permission in unix Post 302593417 by frank_rizzo on Thursday 26th of January 2012 09:40:53 PM
Old 01-26-2012
The absolute way to know is to configure auditing.

You might be able to examine at the file ctime(change time) and correlate that timestamp to the lastlog, wtmp, etc.. I would provide example commands but you don't mention which UNIX variant your using. It varies by system.
 

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LEARN ABOUT BSD

gmtime

TIME(3F)																  TIME(3F)

NAME

       time, ctime, ltime, gmtime - return system time

SYNOPSIS

       integer function time()

       character*(*) function ctime (stime)
       integer stime

       subroutine ltime (stime, tarray)
       integer stime, tarray(9)

       subroutine gmtime (stime, tarray)
       integer stime, tarray(9)

DESCRIPTION

       Time returns the time since 00:00:00 GMT, Jan. 1, 1970, measured in seconds.  This is the value of the UNIX system clock.

       Ctime  converts	a  system  time  to  a	24  character ASCII string.  The format is described under ctime(3).  No 'newline' or NULL will be
       included.

       Ltime and gmtime disect a UNIX time into month, day, etc., either for the local time zone or as GMT.  The order and meaning of each element
       returned in tarray is described under ctime(3).

FILES

       /usr/lib/libU77.a

SEE ALSO

       ctime(3), itime(3F), idate(3F), fdate(3F)

4.2 Berkeley Distribution					   May 15, 1985 							  TIME(3F)
All times are GMT -4. The time now is 08:39 PM.
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