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Top Forums Shell Programming and Scripting Move File Every Last Date of the Month Post 302655963 by elixir_sinari on Thursday 14th of June 2012 05:15:52 AM
Old 06-14-2012
Quote:
Originally Posted by kris.adrianto
@jamie_123
But I still don't understand about the first line of the code you made, could you explain more about this line:
Code:
last_day=$(cal | tr ' ' '\n'|grep -v '^$' |tail -1)

1) cal writes the calendar entry for the current month to standard output.

Code:
         June 2012
Sun Mon Tue Wed Thu Fri Sat
                     1   2
 3   4   5   6   7   8   9
10  11  12  13  14  15  16
17  18  19  20  21  22  23
24  25  26  27  28  29  30

2) The tr command converts each space to a new-line, in the order in which they appear. This operation introduces some blank lines in the output.

Code:








June
2012








Sun
Mon
Tue
Wed
Thu
Fri
Sat























1


2

3


4


5


6


7


8


9
10

11

12

13

14

15

16
17

18

19

20

21

22

23
24

25

26

27

28

29

30

3) The grep command removes these blank lines. So, the last number(day) becomes the last line.
Code:
June
2012
Sun
Mon
Tue
Wed
Thu
Fri
Sat
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

4) tail -1 picks up this last line.
Code:
30



PHEW..... Smilie
 

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DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
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