1LASTLOG(8)                System Management Commands                LASTLOG(8)
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NAME

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

9       lastlog [options]
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DESCRIPTION

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

18       The options which apply to the lastlog command are:
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20       -b, --before DAYS
21           Print only lastlog records older than DAYS.
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23       -C, --clear
24           Clear lastlog record of a user. This option can be used only
25           together with -u (--user)).
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27       -h, --help
28           Display help message and exit.
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30       -R, --root CHROOT_DIR
31           Apply changes in the CHROOT_DIR directory and use the configuration
32           files from the CHROOT_DIR directory.
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34       -S, --set
35           Set lastlog record of a user to the current time. This option can
36           be used only together with -u (--user)).
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38       -t, --time DAYS
39           Print the lastlog records more recent than DAYS.
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41       -u, --user LOGIN|RANGE
42           Print the lastlog record of the specified user(s).
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44           The users can be specified by a login name, a numerical user ID, or
45           a RANGE of users. This RANGE of users can be specified with a min
46           and max values (UID_MIN-UID_MAX), a max value (-UID_MAX), or a min
47           value (UID_MIN-).
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49       If the user has never logged in the message ** Never logged in** will
50       be displayed instead of the port and time.
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52       Only the entries for the current users of the system will be displayed.
53       Other entries may exist for users that were deleted previously.
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NOTE

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

63       The following configuration variables in /etc/login.defs change the
64       behavior of this tool:
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66       LASTLOG_UID_MAX (number)
67           Highest user ID number for which the lastlog entries should be
68           updated. As higher user IDs are usually tracked by remote user
69           identity and authentication services there is no need to create a
70           huge sparse lastlog file for them.
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72           No LASTLOG_UID_MAX option present in the configuration means that
73           there is no user ID limit for writing lastlog entries.
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FILES

76       /var/log/lastlog
77           Database times of previous user logins.
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CAVEATS

80       Large gaps in UID numbers will cause the lastlog program to run longer
81       with no output to the screen (i.e. if in lastlog database there is no
82       entries for users with UID between 170 and 800 lastlog will appear to
83       hang as it processes entries with UIDs 171-799).
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87shadow-utils 4.8.1                11/16/2020                        LASTLOG(8)
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