{"id":104,"title":"linux\u786c\u4ef6\u65f6\u949f\u4e0e\u8f6f\u4ef6\u65f6\u949f\u540c\u6b65","good":0,"bad":0,"hit":3581,"created_at":"2014-10-26 23:04:11","content":"<p>\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e24\u4e2a\u65f6\u949f\u662f\u540c\u6b65\u7684\uff0c\u4f46\u6709\u65f6\u5019\u4e5f\u6709\u53ef\u80fd\u4e0d\u540c\uff0c\u5982\u679c\u4e0d\u540c\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0time error\u9519\u8bef\uff1b<\/p><p>\u67e5\u770b\u8f6f\/\u786c\u4ef6\u65f6\u949f\u7684\u547d\u4ee4\u5206\u522b\u4e3adate\/hwclock<\/p><p>[root@localhost hurong]# date<br\/>Sun Oct 26 07:45:38 PDT 2014<br\/>[root@localhost hurong]# hwclock<br\/>Sun 26 Oct 2014 07:45:46 AM PDT&nbsp; -0.053817 seconds<br\/>\u6ce8\uff1ahwclock\u9700\u8981\u5728root\u7528\u6237\u6743\u9650\u4e0b\u624d\u80fd\u8fd0\u884c\uff1b<\/p><p><br\/><\/p><p>\u5229\u7528hwclock -help\u53ef\u4ee5\u67e5\u770b\u5e2e\u52a9\u4fe1\u606f<\/p><p>[root@localhost hurong]# hwclock -help<br\/>hwclock - query and set the hardware clock (RTC)<br\/><br\/>Usage: hwclock [function] [options...]<br\/><br\/>Functions:<br\/>&nbsp; -h | --help&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; show this help<br\/>&nbsp; -r | --show&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; read hardware clock and print result<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --set&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set the rtc to the time given with --date<br\/><strong>&nbsp; -s | --hctosys&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set the system time from the hardware clock<\/strong><br\/>&nbsp; -w | --systohc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set the hardware clock to the current system time<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --systz&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set the system time based on the current timezone<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --adjust&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjust the rtc to account for systematic drift since<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the clock was last set or adjusted<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --getepoch&nbsp;&nbsp;&nbsp;&nbsp; print out the kernel&#39;s hardware clock epoch value<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --setepoch&nbsp;&nbsp;&nbsp;&nbsp; set the kernel&#39;s hardware clock epoch value to the <br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; value given with --epoch<br\/>&nbsp; -v | --version&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; print out the version of hwclock to stdout<br\/><br\/>Options: <br\/>&nbsp; -u | --utc&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the hardware clock is kept in UTC<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --localtime&nbsp;&nbsp;&nbsp; the hardware clock is kept in local time<br\/>&nbsp; -f | --rtc=path&nbsp;&nbsp;&nbsp;&nbsp; special \/dev\/... file to use instead of default<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --directisa&nbsp;&nbsp;&nbsp; access the ISA bus directly instead of \/dev\/rtc<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --badyear&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ignore rtc&#39;s year because the bios is broken<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --date&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; specifies the time to which to set the hardware clock<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --epoch=year&nbsp;&nbsp; specifies the year which is the beginning of the <br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; hardware clock&#39;s epoch value<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --noadjfile&nbsp;&nbsp;&nbsp; do not access \/etc\/adjtime. Requires the use of<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; either --utc or --localtime<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --adjfile=path specifies the path to the adjust file (default is<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \/etc\/adjtime)<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; do everything except actually updating the hardware<br\/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; clock or anything else<br\/>&nbsp; -D | --debug&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; debug mode<br\/><br\/><\/p><p>\u5f53\u8f6f\u4ef6\u65f6\u949f\u4e0e\u786c\u4ef6\u65f6\u95f4\u4e0d\u4e00\u6837\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u7528hwclock --hctosys\u6765\u5c06\u8f6f\u4ef6\u65f6\u949f\u4e0e\u786c\u4ef6\u65f6\u949f\u540c\u6b65<\/p><p>[root@localhost hurong]# hwclock --hctosys<br\/>[root@localhost hurong]# date<br\/>Sun Oct 26 07:53:24 PDT 2014<br\/>[root@localhost hurong]# hwclock<br\/>Sun 26 Oct 2014 07:53:29 AM PDT&nbsp; -0.329460 seconds<br\/><br\/>\u5982\u679c\u786c\u4ef6\u65f6\u949f\u672c\u8eab\u4e0d\u5bf9\uff0c\u53ef\u4ee5\u7528hwclock --set\u6765\u8fdb\u884c\u4fee\u6539\uff0c\u4fee\u6539\u6b63\u786e\u540e\u518d\u7528hwclock --hctosys\u6765\u540c\u6b65\uff1a\u683c\u5f0f\u5982\u4e0b\uff1a\uff08\u5c06\u786c\u4ef6\u65f6\u949f\u8bbe\u7f6e\u4e3a1996\u5e749\u670822\u65e5 16\u65f645\u520605\u79d2\uff09<br\/><\/p><p>hwclock --set --date=&quot;9\/22\/96 16:45:05&quot;<\/p><p><br\/><\/p><p>\u5982\u679c\u76f4\u63a5\u6539\u53d8\u8f6f\u4ef6\u65f6\u949f\uff0c\u5219\u4f7f\u7528date \u65f6\u95f4\u6233.\u79d2\u6570 \uff0c\u5982\uff1a<\/p><p>date 1223434344.23<br\/><\/p>"}