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Full Discussion: Not getting full name of last logged-in user in linux
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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LEARN ABOUT XFREE86

chown

CHOWN(1)                                                           User Commands                                                          CHOWN(1)

NAME

       chown - change file owner and group

SYNOPSIS

       chown [OPTION]... [OWNER][:[GROUP]] FILE...
       chown [OPTION]... --reference=RFILE FILE...

DESCRIPTION

       This  manual  page documents the GNU version of chown.  chown changes the user and/or group ownership of each given file.  If only an owner
       (a user name or numeric user ID) is given, that user is made the owner of each given file, and the files' group is  not  changed.   If  the
       owner  is  followed  by  a  colon  and a group name (or numeric group ID), with no spaces between them, the group ownership of the files is
       changed as well.  If a colon but no group name follows the user name, that user is made the owner of the files and the group of  the  files
       is changed to that user's login group.  If the colon and group are given, but the owner is omitted, only the group of the files is changed;
       in this case, chown performs the same function as chgrp.  If only a colon is given, or if the entire operand is empty,  neither  the  owner
       nor the group is changed.

OPTIONS

       Change  the  owner  and/or group of each FILE to OWNER and/or GROUP.  With --reference, change the owner and group of each FILE to those of
       RFILE.

       -c, --changes
              like verbose but report only when a change is made

       -f, --silent, --quiet
              suppress most error messages

       -v, --verbose
              output a diagnostic for every file processed

       --dereference
              affect the referent of each symbolic link (this is the default), rather than the symbolic link itself

       -h, --no-dereference
              affect symbolic links instead of any referenced file (useful only on systems that can change the ownership of a symlink)

       --from=CURRENT_OWNER:CURRENT_GROUP
              change the owner and/or group of each file only if its current owner and/or group match those specified here.  Either may  be  omit-
              ted, in which case a match is not required for the omitted attribute

       --no-preserve-root
              do not treat '/' specially (the default)

       --preserve-root
              fail to operate recursively on '/'

       --reference=RFILE
              use RFILE's owner and group rather than specifying OWNER:GROUP values

       -R, --recursive
              operate on files and directories recursively

       The  following  options  modify how a hierarchy is traversed when the -R option is also specified.  If more than one is specified, only the
       final one takes effect.

       -H     if a command line argument is a symbolic link to a directory, traverse it

       -L     traverse every symbolic link to a directory encountered

       -P     do not traverse any symbolic links (default)

       --help display this help and exit

       --version
              output version information and exit

       Owner is unchanged if missing.  Group is unchanged if missing, but changed to login group if implied by a ':' following a  symbolic  OWNER.
       OWNER and GROUP may be numeric as well as symbolic.

EXAMPLES

       chown root /u
              Change the owner of /u to "root".

       chown root:staff /u
              Likewise, but also change its group to "staff".

       chown -hR root /u
              Change the owner of /u and subfiles to "root".

AUTHOR

       Written by David MacKenzie and Jim Meyering.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report chown translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       chown(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/chown>
       or available locally via: info '(coreutils) chown invocation'

GNU coreutils 8.28                                                 January 2018                                                           CHOWN(1)
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