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Full Discussion: Urgent for date increment
Top Forums UNIX for Beginners Questions & Answers Urgent for date increment Post 303040030 by drl on Tuesday 22nd of October 2019 07:40:41 AM
Old 10-22-2019
Hi.

If you are going to be dealing with dates frequently, you might want to look at a package called dateutils. It is available on several platforms. I use Debian, but it's available even on Apple/macOS via brew. Here is a demonstration, note that the key command is simply dateutils.deq:
Code:
#!/usr/bin/env bash

# @(#) s4       Demonstrate date sequence, dseq (part of dateutils).

# Infrastructure.
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C dateutils.dseq specimen

rm -f f1
pl " Starting, ending dates:"
# date1="2012-01-01"
# date2="2012-12-31"
date1="2019-07-31"
date2="2019-10-01"
pe " $date1, $date2"

pl " Results, end-points:"
dateutils.dseq -f "%d-%m-%Y" "$date1" 1 "$date2" > f1
specimen 5:5:5 f1
rm -f f1

exit 0

producing:
Code:
$ ./s4

Environment: LC_ALL = en_US.utf8, LANG = en_US.utf8
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-7-amd64, x86_64
Distribution        : Debian 8.11 (jessie) 
bash GNU bash 4.3.30
dateutils.dseq dseq 0.3.1
specimen (local) 1.17

-----
 Starting, ending dates:
 2019-07-31, 2019-10-01

-----
 Results, end-points:
Edges: 5:5:5 of 63 lines in file "f1"
31-07-2019
01-08-2019
02-08-2019
03-08-2019
04-08-2019
   ---
29-08-2019
30-08-2019
31-08-2019
01-09-2019
02-09-2019
   ---
27-09-2019
28-09-2019
29-09-2019
30-09-2019
01-10-2019

Additional details:
Code:
dateutils.dseq  Generate a sequence of date/times from FIRST to LAST, ... (man)
Path    : /usr/bin/dateutils.dseq
Package : dateutils
Home    : http://www.fresse.org/dateutils
Version : 0.3.1
Type    : ELF 64-bit LSB shared object, x86-64, version 1 ( ...)
Help    : probably available with -h,--help
Home    : https://github.com/hroptatyr/dateutils (doc)

Best wishes ... cheers, drl
 

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LEARN ABOUT LINUX

bswap_16

BSWAP(3)						     Linux Programmer's Manual							  BSWAP(3)

NAME

       bswap_16, bswap_32, bswap_64 - reverse order of bytes

SYNOPSIS

       #include <byteswap.h>

       bswap_16(x);
       bswap_32(x);
       bswap_64(x);

DESCRIPTION

       These macros return a value in which the order of the bytes in their 2-, 4-, or 8-byte arguments is reversed.

RETURN VALUE

       These macros return the value of their argument with the bytes reversed.

ERRORS

       These macros always succeed.

CONFORMING TO

       These macros are GNU extensions.

EXAMPLE

       The  program  below  swaps the bytes of the 8-byte integer supplied as its command-line argument.  The following shell session demonstrates
       the use of the program:

	   $ ./a.out 0x0123456789abcdef
	   0x123456789abcdef ==> 0xefcdab8967452301

   Program source

       #include <stdio.h>
       #include <stdint.h>
       #include <stdlib.h>
       #include <inttypes.h>
       #include <byteswap.h>

       int
       main(int argc, char *argv[])
       {
	   uint64_t x;

	   if (argc != 2) {
	       fprintf(stderr, "Usage: %s <num>
", argv[0]);
	       exit(EXIT_FAILURE);
	   }

	   x = strtoul(argv[1], NULL, 0);
	   printf("0x%" PRIx64 " ==> 0x%" PRIx64 "
", x, bswap_64(x));

	   exit(EXIT_SUCCESS);
       }

SEE ALSO

       byteorder(3), endian(3)

Linux								    2019-03-06								  BSWAP(3)
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