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Top Forums Shell Programming and Scripting How to display a date, 30 days from the current date? Post 302592837 by chihung on Wednesday 25th of January 2012 04:50:59 AM
Old 01-25-2012
Some of the systems (eg Solaris) may not have those features in the 'date' command. If you are looking for portable solution, you may want to use perl. I believe most of the modern system will have perl 4 or above.

Here is my function that you can adopt in your shell script
Code:
function later()
{
  perl -e '
    $t=time()+'${1:-30}'*86400;
    @t=localtime($t);
    printf("%04d-%02d-%02d",$t[5]+1900,$t[4]+1,$t[3]);'
}
later 30

 

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

NAME
Time::localtime - by-name interface to Perl's built-in localtime() function SYNOPSIS
use Time::localtime; printf "Year is %d ", localtime->year() + 1900; $now = ctime(); use Time::localtime; use File::stat; $date_string = ctime(stat($file)->mtime); DESCRIPTION
This module's default exports override the core localtime() 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 ctime() function provides a way of getting at the scalar sense of the original CORE::localtime() 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 v5.18.2 2013-11-04 Time::localtime(3pm)
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