199 lines
5.0 KiB
Groff
199 lines
5.0 KiB
Groff
.\" Copyright (C) 1998-2004 Miquel van Smoorenburg.
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.\"
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.\" This program is free software; you can redistribute it and/or modify
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.\" it under the terms of the GNU General Public License as published by
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.\" the Free Software Foundation; either version 2 of the License, or
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.\" (at your option) any later version.
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.\"
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.\" This program is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public License
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.\" along with this program; if not, write to the Free Software
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.\" Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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.\"
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.TH "LAST, LASTB" "1" "October 2013" "util-linux" "User Commands"
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.SH NAME
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last, lastb \- show a listing of last logged in users
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.SH SYNOPSIS
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.B last
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[options]
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.RI [ username "...] [" tty ...]
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.br
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.B lastb
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[options]
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.RI [ username "...] [" tty ...]
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.SH DESCRIPTION
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.B last
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searches back through the
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.I /var/log/wtmp
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file (or the file designated by the
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.B \-f
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option) and displays a list of all users logged in (and out) since that
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file was created. One or more
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.IR usernames " and/or " ttys
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can be given, in which case
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.B last
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will show only the entries matching those arguments. Names of
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.I ttys
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can be abbreviated, thus
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.B last 0
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is the same as
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.BR "last tty0" .
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.PP
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When catching a SIGINT signal (generated by the interrupt key, usually
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control-C) or a SIGQUIT signal,
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.B last
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will show how far it has searched through the file; in the case of the
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SIGINT signal
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.B last
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will then terminate.
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.PP
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The pseudo user
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.B reboot
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logs in each time the system is rebooted. Thus
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.B last reboot
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will show a log of all the reboots since the log file was created.
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.PP
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.B lastb
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is the same as
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.BR last ,
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except that by default it shows a log of the
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.I /var/log/btmp
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file, which contains all the bad login attempts.
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.SH OPTIONS
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.TP
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.BR \-a , " \-\-hostlast"
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Display the hostname in the last column. Useful in combination with the
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.B \-\-dns
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option.
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.TP
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.BR \-d , " \-\-dns"
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For non-local logins, Linux stores not only the host name of the remote
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host, but its IP number as well. This option translates the IP number
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back into a hostname.
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.TP
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.BR \-f , " \-\-file " \fIfile\fR
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Tell
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.B last
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to use a specific \fIfile\fR instead of
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.IR /var/log/wtmp .
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The
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.B \-\-file
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option can be given multiple times, and all of the specified files will be
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processed.
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.TP
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.BR \-F , " \-\-fulltimes"
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Print full login and logout times and dates.
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.TP
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.BR \-i , " \-\-ip"
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Like
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.B \-\-dns ,
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but displays the host's IP number instead of the name.
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.TP
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.BI \- number
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.TQ
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.BR \-n , " -\-limit " \fInumber\fR
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Tell
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.B last
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how many lines to show.
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.TP
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.BR \-p , " \-\-present " \fItime\fR
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Display the users who were present at the specified time. This is
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like using the options
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.BR \-\-since " and " \-\-until
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together with the same \fItime\fR.
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.TP
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.BR \-R , " \-\-nohostname"
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Suppresses the display of the hostname field.
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.TP
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.BR \-s , " \-\-since " \fItime\fR
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Display the state of logins since the specified
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.IR time .
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This is useful, e.g., to easily determine who was logged in at a
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particular time. The option is often combined with
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.BR \-\-until .
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.TP
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.BR \-t , " \-\-until " \fItime\fR
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Display the state of logins until the specified
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.IR time .
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.TP
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.BI \-\-time\-format " format"
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Define the output timestamp
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.I format
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to be one of
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.IR notime ,
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.IR short ,
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.IR full ,
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or
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.IR iso .
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The
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.I notime
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variant will not print any timestamps at all,
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.I short
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is the default, and
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.I full
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is the same as the
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.B \-\-fulltimes
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option. The
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.I iso
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variant will display the timestamp in ISO-8601 format. The ISO format
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contains timezone information, making it preferable when printouts are
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investigated outside of the system.
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.TP
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.BR \-w , " \-\-fullnames"
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Display full user names and domain names in the output.
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.TP
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.BR \-x , " \-\-system"
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Display the system shutdown entries and run level changes.
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.SH TIME FORMATS
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The options that take the
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.I time
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argument understand the following formats:
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.TS
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l2 l.
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YYYYMMDDhhmmss
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YYYY-MM-DD hh:mm:ss
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YYYY-MM-DD hh:mm (seconds will be set to 00)
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YYYY-MM-DD (time will be set to 00:00:00)
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hh:mm:ss (date will be set to today)
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hh:mm (date will be set to today, seconds to 00)
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now
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yesterday (time is set to 00:00:00)
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today (time is set to 00:00:00)
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tomorrow (time is set to 00:00:00)
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+5min
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-5days
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.TE
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.SH NOTES
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The files
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.I wtmp
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and
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.I btmp
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might not be found. The system only logs information in these files if
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they are present. This is a local configuration issue. If you want the
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files to be used, they can be created with a simple
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.BR touch (1)
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command (for example,
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.IR "touch /var/log/wtmp" ).
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.SH FILES
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/var/log/wtmp
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.br
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/var/log/btmp
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.SH AUTHOR
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.MT miquels@cistron.nl
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Miquel van Smoorenburg
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.ME
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.SH AVAILABILITY
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The last command is part of the util-linux package and is available from
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.UR https://\:www.kernel.org\:/pub\:/linux\:/utils\:/util-linux/
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Linux Kernel Archive
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.UE .
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.SH "SEE ALSO"
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.BR login (1),
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.BR wtmp (5),
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.BR init (8),
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.BR shutdown (8)
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