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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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Time::gmtime(3pm)					 Perl Programmers Reference Guide					 Time::gmtime(3pm)

NAME
Time::gmtime - by-name interface to Perl's built-in gmtime() function SYNOPSIS
use Time::gmtime; $gm = gmtime(); printf "The day in Greenwich is %s ", (qw(Sun Mon Tue Wed Thu Fri Sat Sun))[ $gm->wday() ]; use Time::gmtime qw(:FIELDS); gmtime(); printf "The day in Greenwich is %s ", (qw(Sun Mon Tue Wed Thu Fri Sat Sun))[ $tm_wday ]; $now = gmctime(); use Time::gmtime; use File::stat; $date_string = gmctime(stat($file)->mtime); DESCRIPTION
This module's default exports override the core gmtime() function, replacing it with a version that returns "Time::tm" objects. This object has methods that return the similarly named structure field name from the C's tm structure from time.h; namely sec, min, hour, mday, mon, year, wday, yday, and isdst. You may also import all the structure fields directly into your namespace as regular variables using the :FIELDS import tag. (Note that this still overrides your core functions.) Access these fields as variables named with a preceding "tm_" in front their method names. Thus, "$tm_obj->mday()" corresponds to $tm_mday if you import the fields. The gmctime() function provides a way of getting at the scalar sense of the original CORE::gmtime() function. To access this functionality without the core overrides, pass the "use" an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the "CORE::" pseudo-package. NOTE
While this class is currently implemented using the Class::Struct module to build a struct-like class, you shouldn't rely upon this. AUTHOR
Tom Christiansen perl v5.16.3 2013-02-26 Time::gmtime(3pm)
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