lastb(1)

1LAST,LASTB(1)         Linux System Administrator's Manual        LAST,LASTB(1)
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NAME

6       last, lastb - show listing of last logged in users
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SYNOPSIS

9       last  [-R] [-num] [ -n num ] [-adiox] [ -f file ] [ -t YYYYMMDDHHMMSS ]
10       [name...]  [tty...]
11       lastb [-R] [-num] [ -n num ] [ -f file ] [-adiox] [name...]  [tty...]
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DESCRIPTION

14       Last searches back through the file /var/log/wtmp (or the  file  desig‐
15       nated  by  the -f flag) and displays a list of all users logged in (and
16       out) since that file was created.  Names of  users  and  tty's  can  be
17       given,  in  which  case  last will show only those entries matching the
18       arguments.  Names of ttys can be abbreviated, thus last 0 is  the  same
19       as last tty0.
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21       When last catches a SIGINT signal (generated by the interrupt key, usu‐
22       ally control-C) or a SIGQUIT signal (generated by the quit key, usually
23       control-\), last will show how far it has searched through the file; in
24       the case of the SIGINT signal last will then terminate.
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26       The pseudo user reboot logs in each time the system is rebooted.   Thus
27       last  reboot will show a log of all reboots since the log file was cre‐
28       ated.
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30       Lastb is the same as last, except that by default it shows a log of the
31       file /var/log/btmp, which contains all the bad login attempts.
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OPTIONS

34       -num   This is a count telling last how many lines to show.
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36       -n num The same.
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38       -t YYYYMMDDHHMMSS
39              Display  the  state of logins as of the specified time.  This is
40              useful, e.g., to determine easily who was logged in at a partic‐
41              ular  time  --  specify  that  time  with -t and look for "still
42              logged in".
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44       -f file
45              Specifies a file to search other than /var/log/wtmp.
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47       -R     Suppresses the display of the hostname field.
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49       -a     Display the hostname in the last column. Useful  in  combination
50              with the next flag.
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52       -d     For non-local logins, Linux stores not only the host name of the
53              remote host but its IP number as well.  This  option  translates
54              the IP number back into a hostname.
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56       -i     This  option is like -d in that it displays the IP number of the
57              remote host, but it displays the IP number  in  numbers-and-dots
58              notation.
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60       -o     Read  an  old-type  wtmp  file  (written by linux-libc5 applica‐
61              tions).
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63       -x     Display the system shutdown entries and run level changes.
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NOTES

66       The files wtmp and btmp might not be found. The system only logs infor‐
67       mation  in  these files if they are present. This is a local configura‐
68       tion issue. If you want the files to be used, they can be created  with
69       a simple touch(1) command (for example, touch /var/log/wtmp).
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FILES

72       /var/log/wtmp
73       /var/log/btmp
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AUTHOR

76       Miquel van Smoorenburg, miquels@cistron.nl
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