以小时和分钟获取当前时间

Question

我正在尝试从系统中收集信息,我需要以小时和分钟为单位获取当前时间.

目前我有:

date | awk '{print $4}'

输出如下:

16:18:54

如何切断秒？

Answer 1

提供格式字符串:

date +"%H:%M"

运行man date将提供所有格式选项

%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, space padded ( 0..23); same as %_H
%l     hour, space padded ( 1..12); same as %_I
%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 time zone (e.g., -0400)
%:z    +hh:mm numeric time zone (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)

Answer 2

对于你的问题，我有另一个解决方案。

在第一次使用时date，输出是这样的：

Thu 28 Jan 2021 22:29:40 IST

然后，如果您只想以小时和分钟显示当前时间，则可以使用以下命令：

date | cut -d " " -f5 | cut -d ":" -f1-2 

然后输出：

22:29

Answer 3

你可以使用命令

date | awk '{print $4}'| cut -d ':' -f3

正如您提到的，仅使用date|awk '{print $4}'管道会给您带来类似的结果

20:18:19

正如我们所看到的，如果我们想要提取该字符串的某些部分，那么我们需要一个分隔符，对于我们的情况来说:，所以我们决定在 的基础上进行切割:。现在这个分隔符会将字符串分成三部分，即 20 ,18 和 19 ，因为我们想要第二部分，所以我们在命令中使用 -f2 。总结 ，

cut：根据分隔符截断一些字符串。

-d：分隔符（此处:）

-f2：我们想要的被砍掉的令牌。

Answer 4

bash 版本 >= 4.2：

printf "%(%H:%M)T\n"

或者

printf -v foo "%(%H:%M)T\n"
echo "$foo"

看：man bash