Provided by: login_4.2-3.1ubuntu5_amd64
faillog - 显示登录失败记录或设置登录失败限制
faillog displays the contents of the failure log database (/var/log/faillog). It can also set the failure counters and limits. When faillog is run without arguments, it only displays the faillog records of the users who had a login failure.
faillog 可以接受的选项有： -a, --all Display (or act on) faillog records for all users having an entry in the faillog database. 用户的范围可以使用 -u 选项限制。 In display mode, this is still restricted to existing users but forces the display of the faillog entries even if they are empty. With the -l, -m, -r, -t options, the users' records are changed, even if the user does not exist on the system. This is useful to reset records of users that have been deleted or to set a policy in advance for a range of users. -h, --help 现实帮助信息并退出。 -l, --lock-secs SEC 登录失败后锁定账户 SEC 秒。 此选项要求对 /var/log/faillog 有写入权限。 -m, --maximum MAX Set the maximum number of login failures after the account is disabled to MAX. Selecting a MAX value of 0 has the effect of not placing a limit on the number of failed logins. The maximum failure count should always be 0 for root to prevent a denial of services attack against the system. 此选项要求对 /var/log/faillog 有写入权限。 -r, --reset 重置登录失败计数。 此选项要求对 /var/log/faillog 有写入权限。 -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -t, --time DAYS 显示新于 DAYS 的登录失败记录。 -u, --user LOGIN|RANGE Display faillog record or maintains failure counters and limits (if used with -l, -m or -r options) only for the specified user(s). 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-). When none of the -l, -m, or -r options are used, faillog displays the faillog record of the specified user(s).
faillog only prints out users with no successful login since the last failure. To print out a user who has had a successful login since their last failure, you must explicitly request the user with the -u flag, or print out all users with the -a flag.
/var/log/faillog Failure logging file.