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Full Discussion: UID problem
Top Forums UNIX for Dummies Questions & Answers UID problem Post 8294 by rwb1959 on Tuesday 9th of October 2001 02:49:15 PM
Old 10-09-2001
Has your system ever been attached to the internet
prior to that first shutdown you mention?
Was ftp or telent active?

What I'm driving at here is that you may have been cracked
since you mention you get the powerdown message when you
try to login with the other users. You also mention that
these logins had worked previously. You may also want
to check what your system is doing with ps and who as well as
taking a look in /var/log/messages and /var/log/secure for any
abnormalities (i.e. large block of garbage).

If none of this is true, I don't know what else may be the
cause. You seem to have added new users properly...
useradd then passwd
...however, my recommendation would be the same...
save all your important data and configuration files then
wipe the disk clean and reinstall Linux. Before you connect
to the internet, be sure to secure (if not turn off) ftp and telnet.
 

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LEARN ABOUT LINUX

lastlog

LASTLOG(8)						    System Management Commands							LASTLOG(8)

NAME

       lastlog - reports the most recent login of all users or of a given user

SYNOPSIS

       lastlog [options]

DESCRIPTION

       lastlog formats and prints the contents of the last login log /var/log/lastlog file. The login-name, port, and last login time will be
       printed. The default (no flags) causes lastlog entries to be printed, sorted by their order in /etc/passwd.

OPTIONS

       The options which apply to the lastlog command are:

       -b, --before DAYS
	   Print only lastlog records older than DAYS.

       -h, --help
	   Display help message and exit.

       -t, --time DAYS
	   Print the lastlog records more recent than DAYS.

       -u, --user LOGIN|RANGE
	   Print the lastlog record of the specified user(s).

	   The users can be specified by a login name, a numerical user ID, or a RANGE of users. This RANGE of users can be specified with a min
	   and max values (UID_MIN-UID_MAX), a max value (-UID_MAX), or a min value (UID_MIN-).

       If the user has never logged in the message ** Never logged in** will be displayed instead of the port and time.

       Only the entries for the current users of the system will be displayed. Other entries may exist for users that were deleted previously.

NOTE

       The lastlog file is a database which contains info on the last login of each user. You should not rotate it. It is a sparse file, so its
       size on the disk is usually much smaller than the one shown by "ls -l" (which can indicate a really big file if you have in passwd users
       with a high UID). You can display its real size with "ls -s".

FILES

       /var/log/lastlog
	   Database times of previous user logins.

CAVEATS

       Large gaps in UID numbers will cause the lastlog program to run longer with no output to the screen (i.e. if in lastlog database there is
       no entries for users with UID between 170 and 800 lastlog will appear to hang as it processes entries with UIDs 171-799).

System Management Commands					    06/24/2011								LASTLOG(8)
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