date命令查看和修改时间 ntpdate同步时间 sleep休眠命令
- 2015-05-21 22:38:00
- admin
- 原创 2086
一、linux时间相关命令使用
查看时间:
当前时区查看时间:date //2015年 05月 21日 星期四 22:41:44 CST(China Standard Time)
查看UTC时区时间:date -u //2015年 05月 21日 星期四 14:42:44 UTC
指定格式查看:date "+%Y-%m-%d %H:%M:%S %x %X" //2015-05-21 23:00:56 2015年05月21日 23时00分56秒
查看时间戳:date "+%s" //1432310620 //seconds since 1970-01-01 00:00:00 UTC
当前时间:date -d now
昨天时间:date -d yesterday
2天以前:date -d "2 days ago"
100天以前的日期:date -d "-100 days"
50天后的日期:date -d "50 days"
时间戳转换为时间:date -d @1447940395
时间戳转换为时间:date -d @1447940395.123
设置时间:
设置日期:date -s "20150309",同时将时间设置为00:00:00
设置时间:date -s "14:31:00"
设置日期和时间:date -s "20150309 14:31:00"
查看CMOS硬件时钟:clock -r
设置CMOS硬件时钟:clock -w,修改系统时间后需要执行此操作
同步时间:ntpdate time.nist.gov
详细说明:
FORMAT controls the output. Interpreted sequences are:
%% a literal %%a locale’s abbreviated weekday name (e.g., Sun)
%A locale’s full weekday name (e.g., Sunday)
%b locale’s abbreviated month name (e.g., Jan)
%B locale’s full month name (e.g., January)
%c locale’s date and time (e.g., Thu Mar 3 23:05:25 2005)
%C century; like %Y, except omit last two digits (e.g., 20)
%d day of month (e.g, 01)
%D date; same as %m/%d/%y
%e day of month, space padded; same as %_d
%F full date; same as %Y-%m-%d
%g last two digits of year of ISO week number (see %G)
%G year of ISO week number (see %V); normally useful only with %V
%h same as %b
%H hour (00..23)
%I hour (01..12)
%j day of year (001..366)
%k hour ( 0..23)
%l hour ( 1..12)
%m month (01..12)
%M minute (00..59)
%n a newline
%N nanoseconds (000000000..999999999)
%p locale’s equivalent of either AM or PM; blank if not known
%P like %p, but lower case
%r locale’s 12-hour clock time (e.g., 11:11:04 PM)
%R 24-hour hour and minute; same as %H:%M
%s seconds since 1970-01-01 00:00:00 UTC
%S second (00..60)
%t a tab
%T time; same as %H:%M:%S
%u day of week (1..7); 1 is Monday
%U week number of year, with Sunday as first day of week (00..53)
%V ISO week number, with Monday as first day of week (01..53)
%w day of week (0..6); 0 is Sunday
%W week number of year, with Monday as first day of week (00..53)
%x locale’s date representation (e.g., 12/31/99)
%X locale’s time representation (e.g., 23:13:48)
%y last two digits of year (00..99)
%Y year
%z +hhmm numeric timezone (e.g., -0400)
%:z +hh:mm numeric timezone (e.g., -04:00)
%::z +hh:mm:ss numeric time zone (e.g., -04:00:00)
%:::z numeric time zone with : to necessary precision (e.g., -04, +05:30)
%Z alphabetic time zone abbreviation (e.g., EDT)
By default, date pads numeric fields with zeroes. The following optional flags may follow ‘%’:
- (hyphen) do not pad the field
_ (underscore) pad with spaces
0 (zero) pad with zeros
^ use upper case if possible
# use opposite case if possible
二、sleep休眠命令
sleep 0.5,休眠0.5秒
sleep 10s,休眠10秒
sleep 1m, 休眠1分钟
usleep,默认休眠1微秒
usleep 100,休眠100微秒