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Full Discussion: Change the date format
Top Forums Shell Programming and Scripting Change the date format Post 302685737 by prithvirao17 on Monday 13th of August 2012 09:28:47 AM
Old 08-13-2012
Change the date format
Hi,

I was looking for a script to change the date from one format to other. A search in the forum gave me the below script as a result.

Code:
 
#! /bin/ksh

format=YYYYMMDD

YEAR=${format%????}
DAY=${format#??????}
MON=${format#$YEAR}
MON=${MON%$DAY}
echo $MON/$DAY/$YEAR

I got it from the below link
https://www.unix.com/shell-programmin...m-dd-yyyy.html

The above script works perfectly fine. But I'm really not sure how the above script works. I'm just an amateur when it comes to RegEx. A search on google did not help me either.

My question, how the above script works? Can someone trace an example for me?

Thanks
 

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LEARN ABOUT CENTOS

dm_zdump

DM_ZDUMP(1)						User Contributed Perl Documentation					       DM_ZDUMP(1)

NAME

       dm_zdump - timezone dumper

SYNOPSIS

       This performs the same operation as the unix 'zdump' command, but using the Date::Manip module.

	  dm_zdump [-v] [-c YEAR] [ZONE ZONE ...]

DESCRIPTION

       This displays the current time in each ZONE named on the command line unless the -v option is given.

       -h, --help
	   Print online help.

       -v, --verbose
	   This displays all critical dates (i.e. the times when a time change occurs due to the timezone description) for each of the timezones
	   listed (or the local timezone if none are listed).

	   Each critical date is printed as two lines of output: the last second before the change occurs, and the first second of the new time.

	   By default, all critical dates from Jan 1, 0001 until the year 20 years in the future are printed, but this can be changed with the -c
	   option.

       -c, --cutoff YEAR
	   This specifies the cutoff year. All critical dates up to the start of YEAR are given. The GMT time Jan 01, YEAR at 00:00:00 is the
	   cutoff time.

KNOWN BUGS

       None known.

BUGS AND QUESTIONS

       Please refer to the Date::Manip::Problems documentation for information on submitting bug reports or questions to the author.

SEE ALSO

       Date::Manip::Date

LICENSE

       This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

       Sullivan Beck (sbeck@cpan.org)

perl v5.16.3							    2014-06-09							       DM_ZDUMP(1)
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