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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | TIME FORMATS | NOTES | FILES | AUTHOR | AVAILABILITY | SEE ALSO | COLOPHON |
LAST, LASTB(1) User Commands LAST, LASTB(1)
last, lastb - show a listing of last logged in users
last [options] [username...] [tty...]
lastb [options] [username...] [tty...]
last searches back through the /var/log/wtmp file (or the file
designated by the -f option) and displays a list of all users logged
in (and out) since that file was created. One or more usernames
and/or ttys can be given, in which case last will show only the
entries matching those arguments. Names of ttys can be abbreviated,
thus last 0 is the same as last tty0.
When catching a SIGINT signal (generated by the interrupt key,
usually control-C) or a SIGQUIT signal, last will show how far it has
searched through the file; in the case of the SIGINT signal last will
then terminate.
The pseudo user reboot logs in each time the system is rebooted.
Thus last reboot will show a log of all the reboots since the log
file was created.
lastb is the same as last, except that by default it shows a log of
the /var/log/btmp file, which contains all the bad login attempts.
-a, --hostlast
Display the hostname in the last column. Useful in
combination with the --dns option.
-d, --dns
For non-local logins, Linux stores not only the host name of
the remote host, but its IP number as well. This option
translates the IP number back into a hostname.
-f, --file file
Tell last to use a specific file instead of /var/log/wtmp.
The --file option can be given multiple times, and all of the
specified files will be processed.
-F, --fulltimes
Print full login and logout times and dates.
-i, --ip
Like --dns , but displays the host's IP number instead of the
name.
-number
-n, --limit number
Tell last how many lines to show.
-p, --present time
Display the users who were present at the specified time.
This is like using the options --since and --until together
with the same time.
-R, --nohostname
Suppresses the display of the hostname field.
-s, --since time
Display the state of logins since the specified time. This is
useful, e.g., to easily determine who was logged in at a
particular time. The option is often combined with --until.
-t, --until time
Display the state of logins until the specified time.
--time-format format
Define the output timestamp format to be one of notime, short,
full, or iso. The notime variant will not print any
timestamps at all, short is the default, and full is the same
as the --fulltimes option. The iso variant will display the
timestamp in ISO-8601 format. The ISO format contains
timezone information, making it preferable when printouts are
investigated outside of the system.
-w, --fullnames
Display full user names and domain names in the output.
-x, --system
Display the system shutdown entries and run level changes.
The options that take the time argument understand the following
formats:
YYYYMMDDhhmmss
YYYY-MM-DD hh:mm:ss
YYYY-MM-DD hh:mm (seconds will be set to 00)
YYYY-MM-DD (time will be set to 00:00:00)
hh:mm:ss (date will be set to today)
hh:mm (date will be set to today, seconds to 00)
now
yesterday (time is set to 00:00:00)
today (time is set to 00:00:00)
tomorrow (time is set to 00:00:00)
+5min
-5days
The files wtmp and btmp might not be found. The system only logs
information in these files if they are present. This is a local
configuration issue. If you want the files to be used, they can be
created with a simple touch(1) command (for example, touch
/var/log/wtmp).
/var/log/wtmp
/var/log/btmp
Miquel van Smoorenburg ⟨miquels@cistron.nl⟩
The last command is part of the util-linux package and is available
from Linux Kernel Archive
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.
login(1), wtmp(5), init(8), shutdown(8)
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion of the page, or you believe there is a better or more up-to-date
source for the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original man‐
ual page), send a mail to man-pages@man7.org
util-linux October 2013 LAST, LASTB(1)