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Top Forums UNIX for Advanced & Expert Users Not getting full name of last logged-in user in linux Post 302584834 by admin_xor on Monday 26th of December 2011 04:50:26 AM
Old 12-26-2011
You have to use last with -w switch which shows the full logon id of a user:
Code:
last -w

I do not think there's any other way of checking the owner of the machine. But, the files where the last command checks gets the information (/var/log/wtmp) can be deleted by a log maintenance program like logrotate. So, you may want to verify the first login time of the suspected machine owner with the "modify" time of one of the files like .profile or .bash_profile in root's home directory /root. These files get created when the root account gets created i.e during the installation. If nobody has changed the content of these files, the modify time will be the same as the file creation time.
Code:
# stat /root/.bash_profile
  File: `/root/.bash_profile'
  Size: 176             Blocks: 8          IO Block: 4096   regular file
Device: 802h/2050d      Inode: 795840      Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2011-11-22 18:21:32.962989477 -0800
Modify: 2009-05-20 03:45:02.000000000 -0700
Change: 2011-11-21 04:15:47.124320704 -0800

These are not convenient ways of determining the exact owner of the machine. But, still you can work your way out with these. If you are working on production environment, I would suggest that you implement a schema for each ID creation and tag the IDs with information like who requested for that ID, etc.

Hope this helps.
 

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CHOWN(3)								 1								  CHOWN(3)

chown - Changes file owner

SYNOPSIS
bool chown (string $filename, mixed $user) DESCRIPTION
Attempts to change the owner of the file $filename to user $user. Only the superuser may change the owner of a file. PARAMETERS
o $filename - Path to the file. o $user - A user name or number. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Simple chown(3) usage <?php // File name and username to use $file_name= "foo.php"; $path = "/home/sites/php.net/public_html/sandbox/" . $file_name ; $user_name = "root"; // Set the user chown($path, $user_name); // Check the result $stat = stat($path); print_r(posix_getpwuid($stat['uid'])); ?> The above example will output something similar to: Array ( [name] => root [passwd] => x [uid] => 0 [gid] => 0 [gecos] => root [dir] => /root [shell] => /bin/bash ) NOTES
Note This function will not work on remote files as the file to be examined must be accessible via the server's filesystem. Note When safe mode is enabled, PHP checks whether the files or directories being operated upon have the same UID (owner) as the script that is being executed. SEE ALSO
chmod(3), chgrp(3). PHP Documentation Group CHOWN(3)
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