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Full Discussion: Print Nth to last field
Top Forums UNIX for Dummies Questions & Answers Print Nth to last field Post 302729217 by RECrerar on Friday 9th of November 2012 10:12:10 AM
Old 11-09-2012
Print Nth to last field

Hey,

I'm sure this is answered somewhere but my Googling has turned up nothing. I have a file with data in the following format:

Code:
<desription of event> at <time and date>

The desription of the event is variable length and hence when the list is displayed it is hard to easily see the date (and it looks messy). To resolve this, I would like to print the information with the time and date first followed by the description and just ditch the word at. For example:

Code:
Layout in file:

Eat some pies at Thu Oct 11 03:52:30 GMT 2012
Got stuck on this code at Thu Oct 11 04:51:30 GMT 2012
Eat many more pies at Thu Oct 11 05:52:30 GMT 2012

desired printed output:

Thu Oct 11 03:52:30 GMT 2012 Eat some pies
Thu Oct 11 04:51:30 GMT 2012 Got stuck on this code
Thu Oct 11 05:52:30 GMT 2012 Eat many more pies

I can do this easily using awk when I know the length of each line but I don't.

Is there a way to get awk to count from the end rather than the start as the date will always be the same length?

Alternatively is there a way to switch the text either side of "at" as I don't think "at" will ever appear in any of the real descriptions?

If anyone can help, it would be really appreciated.

Thanks

Last edited by RECrerar; 11-09-2012 at 11:15 AM.. Reason: Typos
 

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Date::Parse(3pm)					User Contributed Perl Documentation					  Date::Parse(3pm)

NAME
Date::Parse - Parse date strings into time values SYNOPSIS
use Date::Parse; $time = str2time($date); ($ss,$mm,$hh,$day,$month,$year,$zone) = strptime($date); DESCRIPTION
"Date::Parse" provides two routines for parsing date strings into time values. str2time(DATE [, ZONE]) "str2time" parses "DATE" and returns a unix time value, or undef upon failure. "ZONE", if given, specifies the timezone to assume when parsing if the date string does not specify a timezone. strptime(DATE [, ZONE]) "strptime" takes the same arguments as str2time but returns an array of values "($ss,$mm,$hh,$day,$month,$year,$zone)". Elements are only defined if they could be extracted from the date string. The $zone element is the timezone offset in seconds from GMT. An empty array is returned upon failure. MULTI-LANGUAGE SUPPORT Date::Parse is capable of parsing dates in several languages, these include English, French, German and Italian. $lang = Date::Language->new('German'); $lang->str2time("25 Jun 1996 21:09:55 +0100"); EXAMPLE DATES
Below is a sample list of dates that are known to be parsable with Date::Parse 1995:01:24T09:08:17.1823213 ISO-8601 1995-01-24T09:08:17.1823213 Wed, 16 Jun 94 07:29:35 CST Comma and day name are optional Thu, 13 Oct 94 10:13:13 -0700 Wed, 9 Nov 1994 09:50:32 -0500 (EST) Text in ()'s will be ignored. 21 dec 17:05 Will be parsed in the current time zone 21-dec 17:05 21/dec 17:05 21/dec/93 17:05 1999 10:02:18 "GMT" 16 Nov 94 22:28:20 PST LIMITATION
Date::Parse uses Time::Local internally, so is limited to only parsing dates which result in valid values for Time::Local::timelocal. This generally means dates between 1901-12-17 00:00:00 GMT and 2038-01-16 23:59:59 GMT BUGS
When both the month and the date are specified in the date as numbers they are always parsed assuming that the month number comes before the date. This is the usual format used in American dates. The reason why it is like this and not dynamic is that it must be deterministic. Several people have suggested using the current locale, but this will not work as the date being parsed may not be in the format of the current locale. My plans to address this, which will be in a future release, is to allow the programmer to state what order they want these values parsed in. AUTHOR
Graham Barr <gbarr@pobox.com> COPYRIGHT
Copyright (c) 1995-2009 Graham Barr. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-07-28 Date::Parse(3pm)
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