Provided by: login_4.5-1.1ubuntu4_amd64 bug


       lastlog - 报告所有用户的最近登录情况,或者指定用户的最近登录情况


       lastlog [选项]


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


       lastlog 命令可以接受的选项有:

       -b, --before DAYS
           只显示老于 DAYS 的最近登录记录。

       -C, --clear
           Clear lastlog record of a user. This option can be used only together with -u

       -h, --help

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the
           CHROOT_DIR directory.

       -S, --set
           Set lastlog record of a user to the current time. This option can be used only
           together with -u (--user)).

       -t, --time DAYS
           只现实新于 DAYS 的最近登录记录。

       -u, --user LOGIN|RANGE

           The users can be specified by a login name, a numerical user ID, or a RANGE of users.
           This RANGE of users can be specified with a min and max values (UID_MIN-UID_MAX), a
           max value (-UID_MAX), or a min value (UID_MIN-).

       如果用户从来没有登录过,将会显示 ** 从未登录 ** 而不是端口和时间。

       Only the entries for the current users of the system will be displayed. Other entries may
       exist for users that were deleted previously.


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


           Database times of previous user logins.


       Large gaps in UID numbers will cause the lastlog program to run longer with no output to
       the screen (i.e. if in lastlog database there is no entries for users with UID between 170
       and 800 lastlog will appear to hang as it processes entries with UIDs 171-799).