-C, --clear Clear lastlog record of an user. This option can be used only together with -u (--user)).
-h, --help 现实帮助信息并退出。
-R, --rootCHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
-S, --set Set lastlog record of an user to the current time. This option can be used only together with -u (--user)).
-t, --timeDAYS 只现实新于 DAYS 的最近登录记录。
-u, --userLOGIN|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-).