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Full Discussion: who modified my file!!
Top Forums UNIX for Dummies Questions & Answers who modified my file!! Post 87189 by vijaygoutham on Friday 21st of October 2005 02:17:10 AM
Old 10-21-2005
Unix allows you to give three levels of permissions to the file.
a. Owner
b. Group
c. Others

When we do a ls -lt, the following is a sample output.

-rwxrwxrwx 1 vijay dev 4692060 Oct 13 17:22 core

The above file (core) the owner user is "vijay" and owner group is "dev". (vijay user is part of dev group. also dev group has other users as well).

rwxrwxrwx is the files permissions. The first three 'rwx' corresponds to the 'owner' user. The next three to the 'group' (all users within that group) and the last three is for all others.

So in the above example all (the owner i.e. user vijay, all users belonging to group 'dev' and all others have read, write and execute permissions)

When i change the permission as 'chmod 640 core', the permission becomes 'rw_r_____'. (Note - the owner of the file only can change the permission using chmod)

So now
user 'vijay' has permissions to read and write
all users under group dev have permissions to read
all other users do not have any permissions on the file.


So you can give permissions (if you are the owner) accordingly as to who all (users) can modify the file.

I am not aware of any command in Unix which will give you the user who last edited the file.
 

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LEARN ABOUT X11R4

logindevperm

logindevperm(4) 						   File Formats 						   logindevperm(4)

NAME

       logindevperm, fbtab - login-based device permissions

SYNOPSIS

       /etc/logindevperm

DESCRIPTION

       The  /etc/logindevperm  file  contains  information  that is used by login(1) and ttymon(1M) to change the owner, group, and permissions of
       devices upon logging into or out of a console device. By default, this file contains lines for the keyboard, mouse, audio, and frame buffer
       devices.

       The owner of the devices listed in /etc/logindevperm is set to the owner of the console by login(1). The group of the devices is set to the
       owner's group specified in /etc/passwd. The permissions are set as specified in /etc/logindevperm.

       Fields are separated by TAB and/or SPACE characters. Blank lines and comments can appear anywhere in the file; comments start with a  hash-
       mark, ` # ', and continue to the end of the line.

       The first field specifies the name of a console device (for example, /dev/console). The second field specifies the permissions to which the
       devices in the device_list field (third field) will be set.  These permissions must be expressed in octal format.  For  example,  O774.	 A
       device_list  is	a  colon-separated list of device names.  Note that a device name must be a /dev link.	A device entry that is a directory
       name and ends with "/*" specifies all entries in the directory (except "." and ".."). For example, "/dev/fbs/*" specifies all frame  buffer
       devices.

       Once the devices are owned by the user, their permissions and ownership can be changed using chmod(1) and chown(1), as with any other user-
       owned file.

       Upon logout the owner and group of these devices will be reset by ttymon(1M) to owner root and root's group  as	specified  in  /etc/passwd
       (typically other). The permissions are set as specified in the /etc/logindevperm file.

FILES

       /etc/passwd     File that contains user group information.

SEE ALSO

       chmod(1), chown(1), login(1), ttymon(1M), passwd(4)

NOTES

       /etc/logindevperm provides a superset of the functionality provided by /etc/fbtab in SunOS 4.x releases.

SunOS 5.10							    22 Oct 2003 						   logindevperm(4)
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