Solved

"last" command

Posted on 2004-08-08
3
292 Views
Last Modified: 2010-04-20
Dear Expert,
In the man page, last command will display all users login into the system since day one setup, however I found my system only display recent one month only, eventhough my system has been setup for years. Where to set to enable the system to track user login for longer period of time?
Thanks you in advance.
Linux Novice,
OMLoo
0
Comment
Question by:omloo
  • 2
3 Comments
 
LVL 4

Expert Comment

by:net_sec_guru
ID: 11749576
you can do a:

last -t <YYYYMMDDHHMMSS>

This will give you a list from that specified date. It gives status of all logins as of that time of date.

Is this what you're looking for?

0
 
LVL 20

Expert Comment

by:Gns
ID: 11751387
This is truncated in the logrotate subsystem, which is there to see to it that logfiles (and similar) don't grow to fill the hdd completely.
Look in the file /etc/logrotate.conf for mention of the wtmp file... Chances are great that you have a stanza like this:
# no packages own lastlog or wtmp -- we'll rotate them here
/var/log/wtmp {
    monthly
    create 0664 root utmp
    rotate 1
}
... which should be selfexplanatory more or less. Look at the manpage for logrotate where the fileformat is documented.

-- Glenn
0
 
LVL 20

Accepted Solution

by:
Gns earned 50 total points
ID: 11751431
Note that you could either remove it from the "logrotations", or set "rotate X" where X is the number of "old files" to keep. In the latter case you'd have /var/log/wtmp for the current month, /var/log/wtmp.1 for the previous month, /var/log/wtmp.2 for the month before that etc up to the total number of files == X. Then you could do "last -f /var/tmp/wtmp.1 ...".
The bad thing with wtmp files like that would be for sessions going "over the month edges", where it couldn't determine start/end of such a session (depending on which file you looked at).
But generally, this is viewed as no big deal:-).

-- Glenn
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Daily system administration tasks often require administrators to connect remote systems. But allowing these remote systems to accept passwords makes these systems vulnerable to the risk of brute-force password guessing attacks. Furthermore there ar…
Setting up Secure Ubuntu server on VMware 1.      Insert the Ubuntu Server distribution CD or attach the ISO of the CD which is in the “Datastore”. Note that it is important to install the x64 edition on servers, not the X86 editions. 2.      Power on th…
Learn several ways to interact with files and get file information from the bash shell. ls lists the contents of a directory: Using the -a flag displays hidden files: Using the -l flag formats the output in a long list: The file command gives us mor…
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

789 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question