Shell's date usage

#man date to see the Help file for date

#date Get the current time

#date-D " -1week" +%y%m%d get last Sunday issue (Day,month,year,hour)

#date--date= " -24 hour" +%y%m%d Ibid.

date_now= ' date+%s ' shell script to assign variable values

Percent output% symbol

%A the weekday abbreviation of the current domain (Sun.. Sat)

%A the current field of the week full write (Sunday. Saturday)

%B the month abbreviation for the current field (Jan. DEC)

%B the full month name of the current field (January). December)

The default time format for the current domain in%c (Sat 12:02:33 EST 1989)

%c n Centennial [00-99]

%d two-bit days (01..31)

%d Short time Format (MM/DD/YY)

%e short format days (1..31)

%F file time format same as%y-%m-%d

%h Same as%b

%H 24-hour Hour (00..23)

%I 12-hour Hour (01..12)

%j the first day of the Year (001..366)

%k short Format 24-hour hour (0..23)

%l Short Format 12-hour hour (1..12)

%m Double-digit month (01..12)

%M double-bit minutes (00..59)

%n line break

%N One-zero seconds (000000000..999999999)

%p Upper-afternoon indication of the current field in uppercase (blank in many locales)

%P the previous afternoon indication of the current field in lowercase (blank in many locales)

%r 12-hour Time representation (time: minute: Second, double bit) times, 12-hour (Hh:mm:ss [ap]m)

%R 24-hour time representation (time: minute, double), 24-hour (hh:mm)

%s from 1970-01-01 00:00:00 to the current time in seconds (a GNU extension)

%s Double-bit seconds second (00..60);

%t horizontal tab stop (tab)

%T 24-hour time representation (HH:MM:SS)

%u number expressed in weeks (starting from Monday 1-7)

%u the first weeks of the year Sunday for start (00..53)

%V the first week of the year Monday for the beginning (01..53)

%w Day of the week Sunday for Start (0..6)

%W the first week of the year Monday for the beginning (00..53)

%x Local date format (MM/DD/YY)

%x local time format (%h:%m:%s)

%y Two-bit year (00..99)

%Y year (1970 ...)

Example: Writing a shell script calculate how many days away from your birthday?

Read-p "Input your Birthday (YYYYMMDD):" Date1
M= ' date--date= ' $date 1 "+%m ' #得到生日的月
D= ' date--date= ' $date 1 "+%d ' #得到生日的日
date_now= ' date+%s ' #得到当前时间的秒值
y= ' Date +%y ' #得到当前时间的年
Birth= ' date--date= ' $y $m$d "+%s ' #得到今年的生日日期的秒值
internal=$ (($birth-$date _now)) #计算今日到生日日期的间隔时间
If ["$internal"-lt "0"]; Then #判断今天的生日是否已过
Birth= ' Date--date= "$ (($y + 1)) $m $d" +%s "#得到明天的生日日期秒值
internal=$ (($birth-$date _now)) #计算今天到下一个生日的间隔时间
Fi
echo "Thereis: $ ((einternal/60/60/24)) days." #输出结果, seconds conversion to day

Creates a file with the current time as the filename.

mkdir ' date+%y%m%d '

The backup takes the time as the file name

Tar cvf./htdocs ' date +%y%m%d '. Tar./*

How does the date command get dates from last week?

Lastmonth= ' Date+%y-%m--date= "-1 month" ' "-01";

Then awk-v as a parameter to pass in a simple point.

#date-D " -1week" "+%y%m%d%A"

Or: #date-D "Last week" +%y%m%d

Extrapolate: Date command gets the day before yesterday, tomorrow, the day after, last month, next month

Date-d "-2 Day" "+%y%m%d%A" or date--date= "2 days Ago" "+%y%m%d%A"

Date-d "-1 Day" "+%y%m%d%A" or date--date= "1 day Ago" "+%y%m%d%A"

Date-d "1 Day" "+%y%m%d%A"

Date-d "2 Day" "+%y%m%d%A"

Date-d "-1 month" "+%y%m%d%A"

Date-d "1 Month" "+%y%m%d%A"

Echo ' date-d '-1 month "+%y-%m-%d%x" '

There are other uses:

date+%s can get Unix timestamp;

Time stamp known for the current date

Date--date= "19700101 +$ (($ ((' date +%s ') + (8*60*60))] sec" +%y%m%d ""%h:%m:%s

PS: Counting from January 01, 1970, +$ (($ (' Date +%s ') + (8*60*60))) SEC indicates how many seconds, where (8*60*60) represents 8 hours, time zone problem, China time is 8 hours from world time.

Transferred from:http://linux.chinaunix.net/bbs/forum-2-1.html

Shell's date usage