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Top Forums Shell Programming and Scripting get all entries after particular date !! Post 302146920 by chella on Friday 23rd of November 2007 03:41:53 AM
Old 11-23-2007
Quote:
Originally Posted by radoulov
f is a variable, its name is arbitrary (it can be any valid variable name).
In Awk uninitialized variables have the numeric value zero.
When the first filed of the current record matches our pattern ($1==dt),
we set f to 1 (or any other number != 0 - for Awk 0 and null mean false,
all others mean true). We check every record
(first check, then set, so the record that matches
is not printed), we print the records once the variable is set to 1 (true).

It goes like this:

Code:
dt="2007-10-19"

record: 2007-10-18 
code: f 
action: checks f is not 0 -> f==0 (uninitialized yet) -> do nothing
code: $1==dt{f=1}
action: $1!=dt -> do nothing

record: 2007-10-19
code: f
action: checks f is not 0 -> f==0 (uninitialized yet) -> do nothing
code: $1==dt{f=1}
action: $1==dt -> set f to 1(true) --> initialized here!

record: 2007-10-20
code: f
action: checks f is not 0 -> f==1 -> default action: print the current record
code: $1==dt{f=1}
action: $1!=dt -> do nothing (even if $1==dt, we will set again f to 1,
but it doesn't matter :)


Thanks a lot for this radoulov :-)

Chella
 

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DATETIMEINTERFACE.FORMAT(3)						 1					       DATETIMEINTERFACE.FORMAT(3)

DateTime::format - Returns date formatted according to given format

       Object oriented style

SYNOPSIS
public string DateTime::format (string $format) DESCRIPTION
string DateTimeImmutable::format (string $format) string DateTimeInterface::format (string $format) Procedural style string date_format (DateTimeInterface $object, string $format) Returns date formatted according to given format. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3) o $format - Format accepted by date(3). RETURN VALUES
Returns the formatted date string on success or FALSE on failure. EXAMPLES
Example #1 DateTimeInterface.format(3) example Object oriented style <?php $date = new DateTime('2000-01-01'); echo $date->format('Y-m-d H:i:s'); ?> Procedural style <?php $date = date_create('2000-01-01'); echo date_format($date, 'Y-m-d H:i:s'); ?> The above example will output: 2000-01-01 00:00:00 NOTES
This method does not use locales. All output is in English. SEE ALSO
date(3). PHP Documentation Group DATETIMEINTERFACE.FORMAT(3)
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