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Full Discussion: How to compare two strings
Top Forums Shell Programming and Scripting How to compare two strings Post 302226966 by otheus on Wednesday 20th of August 2008 09:03:29 AM
Old 08-20-2008
Quote:
Originally Posted by prashant43
Hi all,

I am trying to compare two strings/dates, but its throwing error::Syntax error at line 5:

Please help !!

Any alternate way to compare two dates is also fine....
logdate1=`date -u '+%Y.%m.%d %T'`
sleep 5
logdate2=`date -u '+%Y.%m.%d %T'`
if test $logdate1 -ge $logdate2
then
echo "$logdate1 is greater"
else
echo "$logdate2 is lesset"
fi


Regards
Prashant
You are making it too hard on yourself. Use
Code:
date +%s

Which gives you the time in seconds.

If you need to get the greater/lesser of the date strings, you can instead use the date command as you have it, pipe it through sort, and then use tail -1 (greater) or head -1 (lesser).

Code:
{ date -u '+%Y.%m.%d %T'; sleep 1; date -u '+%Y.%m.%d %T'; } |sort | head -1

 

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DATETIME.SETTIMESTAMP(3)						 1						  DATETIME.SETTIMESTAMP(3)

DateTime::setTimestamp - Sets the date and time based on an Unix timestamp

       Object oriented style

SYNOPSIS
public DateTime DateTime::setTimestamp (int $unixtimestamp) DESCRIPTION
Procedural style DateTime date_timestamp_set (DateTime $object, int $unixtimestamp) Sets the date and time based on an Unix timestamp. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $unixtimestamp - Unix timestamp representing the date. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. EXAMPLES
Example #1 DateTime.setTimestamp(3) example Object oriented style <?php $date = new DateTime(); echo $date->format('U = Y-m-d H:i:s') . " "; $date->setTimestamp(1171502725); echo $date->format('U = Y-m-d H:i:s') . " "; ?> Procedural style <?php $date = date_create(); echo date_format($date, 'U = Y-m-d H:i:s') . " "; date_timestamp_set($date, 1171502725); echo date_format($date, 'U = Y-m-d H:i:s') . " "; ?> The above examples will output something similar to: 1272508903 = 2010-04-28 22:41:43 1171502725 = 2007-02-14 20:25:25 NOTES
Using the Unix timestamp format to construct a new DateTime object is an alternative when using PHP 5.2, as shown in the example below. Example #2 DateTime.setTimestamp(3) alternative in PHP 5.2 <?php $ts = 1171502725; $date = new DateTime("@$ts"); echo $date->format('U = Y-m-d H:i:s') . " "; ?> The above example will output something similar to: 1171502725 = 2007-02-14 20:25:25 SEE ALSO
DateTime.getTimestamp(3). PHP Documentation Group DATETIME.SETTIMESTAMP(3)
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