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Full Discussion: Difference between && and -a
Top Forums UNIX for Dummies Questions & Answers Difference between && and -a Post 302108915 by BOFH on Thursday 1st of March 2007 07:38:06 PM
Old 03-01-2007
You're doing two different things.

If you want to use -a, you need to use it within the test braces. You're making two tests using two sets of braces and need to use && for comparisons outside the test braces.

Code:
#!/bin/ksh

WORK_START_HOUR=8 # 8.00am
WORK_END_HOUR=17 # 5.00pm
CHECK_HOUR=`date +"%H"`
CHECK_HOUR=18
if [ $CHECK_HOUR -ge $WORK_START_HOUR ] && [ $CHECK_HOUR -le $WORK_END_HOUR ]
then
  echo "Hour is in the range of 8 to 17"
else
  echo "Hour is in outside the range of 8 to 17"
fi

Code:
#!/bin/ksh

WORK_START_HOUR=8 # 8.00am
WORK_END_HOUR=17 # 5.00pm
CHECK_HOUR=`date +"%H"`
CHECK_HOUR=18
if [ $CHECK_HOUR -ge $WORK_START_HOUR -a $CHECK_HOUR -le $WORK_END_HOUR ]
then
  echo "Hour is in the range of 8 to 17"
else
  echo "Hour is in outside the range of 8 to 17"
fi

Note the second one works because the entire test is inclosed in a single set of braces.

Carl
 

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DATETIME.SETTIME(3)							 1						       DATETIME.SETTIME(3)

DateTime::setTime - Sets the time

       Object oriented style

SYNOPSIS
public DateTime DateTime::setTime (int $hour, int $minute, [int $second]) DESCRIPTION
Procedural style DateTime date_time_set (DateTime $object, int $hour, int $minute, [int $second]) Resets the current time of the DateTime object to a different time. PARAMETERS
o $object -Procedural style only: A DateTime object returned by date_create(3). The function modifies this object. o $hour - Hour of the time. o $minute - Minute of the time. o $second - Second of the time. RETURN VALUES
Returns the DateTime object for method chaining or FALSE on failure. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | Changed the return value on success from NULL to | | | DateTime. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.setTime(3) example Object oriented style <?php $date = new DateTime('2001-01-01'); $date->setTime(14, 55); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; ?> Procedural style <?php $date = date_create('2001-01-01'); date_time_set($date, 14, 55); echo date_format($date, 'Y-m-d H:i:s') . " "; date_time_set($date, 14, 55, 24); echo date_format($date, 'Y-m-d H:i:s') . " "; ?> The above examples will output something similar to: 2001-01-01 14:55:00 2001-01-01 14:55:24 Example #2 Values exceeding ranges are added to their parent values <?php $date = new DateTime('2001-01-01'); $date->setTime(14, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 55, 65); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(14, 65, 24); echo $date->format('Y-m-d H:i:s') . " "; $date->setTime(25, 55, 24); echo $date->format('Y-m-d H:i:s') . " "; ?> The above example will output: 2001-01-01 14:55:24 2001-01-01 14:56:05 2001-01-01 15:05:24 2001-01-02 01:55:24 SEE ALSO
DateTime.setDate(3), DateTime.setISODate(3). PHP Documentation Group DATETIME.SETTIME(3)
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