LASTLOG(8)

名称
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

大纲

lastlog [选项]

描述

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.

选项

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 (--user)).

-h, --help
    现实帮助信息并退出。

-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
    现实指定用户的最近登录记录。

    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.

注意

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".

配置文件

在 /etc/login.defs 中有如下配置变量，可以用来更改此工具的行为：

LASTLOG_UID_MAX (number)
    Highest user ID number for which the lastlog entries should be updated. As higher user IDs are usually tracked by remote user identity and authentication services there is no need to create a huge sparse lastlog file for them.

    No LASTLOG_UID_MAX option present in the configuration means that there is no user ID limit for writing lastlog entries.

文件

/var/log/lastlog
    Database times of previous user logins.

CAVEATS

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).