lastlog
补充说明
lastlog命令 用于显示系统中所有用户最近一次登录信息。
lastlog文件在每次有用户登录时被查询。可以使用lastlog命令检查某特定用户上次登录的时间，并格式化输出上次登录日志/var/log/lastlog的内容。它根据UID排序显示登录名、端口号（tty）和上次登录时间。如果一个用户从未登录过，lastlog显示 <strong>Never logged</strong> 。注意需要以root身份运行该命令。
语法
lastlog(选项)选项
-b<天数>：显示指定天数前的登录信息；
-h：显示召集令的帮助信息；
-t<天数>：显示指定天数以来的登录信息；
-u<用户名>：显示指定用户的最近登录信息。
实例
lastlog
Username Port From Latest
root pts/0 221.6.45.34 Tue Dec 17 09:40:48 +0800 2013
bin Never logged in
daemon Never logged in
adm Never logged in
lp Never logged in
sync Never logged in
shutdown Never logged in
halt Never logged in
mail Never logged in
news Never logged in
uucp Never logged in
operator Never logged in
games Never logged in
gopher Never logged in
ftp Never logged in
nobody Never logged in
vcsa Never logged in
ntp Never logged in
sshd Never logged in
nscd Never logged in
ldap Never logged in
postfix Never logged in
www Never logged in
mysql Never logged in