linux command


Linux Command – date ใช้ในการแสดงเวลาในรูปแบบที่ต้องการ ซึ่งเป็นเวลาปัจจุบันอ้างอิงกับเวลาในเครื่อง server



1. ใช้แสดงเวลา, วัน, เดือน, ปี

$ date
Sun May 7 13:19:38 ICT 2017


2. แสดงเวลาในรูปแบบที่กำหนด

date +'<format>’

$ date +'%Y/%m/%d %H:%M:%S'
2017/05/07 13:21:54


3. ตั้งเวลาของเครื่อง

date -s ‘format<DD MMM YYYY HH24:MM:SS>’

$ date -s "2 OCT 2006 18:00:00"



 date [OPTION]... [+FORMAT]
 date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]



เป็นคำสั่งที่ใช้ในการแสดงเวลาในรูปแบบที่ต้องการ เวลาที่แสดงคือเวลาของเครื่อง server ปัจจุบัน ซึ่งอาจจะมีการทำ sync กับ ntp  รวมถึงสามารถตั้งเวลาของ server ได้ในกรณีที่เวลาคลาดเคลือนเนื่องจากไม่ได้ทำการ sync เวลากับ ntp server



 Mandatory arguments to long options are mandatory for short options too.

 -d, --date=STRING
 display time described by STRING, not 'now'

 -f, --file=DATEFILE
 like --date; once for each line of DATEFILE

 -I[FMT], --iso-8601[=FMT]
 output date/time in ISO 8601 format. FMT='date' for date only (the default), 'hours', 'minutes', 'seconds', or 'ns' for date and time to the indicated precision. Example:

 -R, --rfc-2822
 output date and time in RFC 2822 format. Example: Mon, 14 Aug 2006 02:34:56 -0600

 output date/time in RFC 3339 format. FMT='date', 'seconds', or 'ns' for date and time to the indicated precision. Example: 2006-08-14 02:34:56-06:00

 -r, --reference=FILE
 display the last modification time of FILE

 -s, --set=STRING
 set time described by STRING

 -u, --utc, --universal
 print or set Coordinated Universal Time (UTC)

 --help display this help and exit

 output version information and exit

 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, 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 day 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)

 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

 After any flags comes an optional field width, as a decimal number; then an optional modifier, which is either E to use the locale's alternate representations if available, or O to
 use the locale's alternate numeric symbols if available.





คำสั่ง Unix – Linux Command

Linux, Unix


Author: Suphakit Annoppornchai


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