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Top Forums Shell Programming and Scripting Unique batch and sequence creation Post 302283797 by cfajohnson on Wednesday 4th of February 2009 04:32:31 AM
Old 02-04-2009
Quote:
Originally Posted by jim mcnamara
Code:
sequence()
{
   if [[ -w sequence.dat ]] ; then
    a=$(<sequence.dat)


A read command will be much faster than command substitution in all shells except ksh93:

Code:
read a < sequence.dat

Quote:
Code:
   a=$(( $a + 1 ))
    echo $a > sequence.dat
    echo $a
   else 
     echo "Error sequence not setup" > 2
     exit 1
   fi

}

 

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RANGE(3)								 1								  RANGE(3)

range - Create an array containing a range of elements

SYNOPSIS
array range (mixed $start, mixed $end, [number $step = 1]) DESCRIPTION
Create an array containing a range of elements. PARAMETERS
o $start - First value of the sequence. o $end - The sequence is ended upon reaching the $end value. o $step - If a $step value is given, it will be used as the increment between elements in the sequence. $step should be given as a posi- tive number. If not specified, $step will default to 1. RETURN VALUES
Returns an array of elements from $start to $end, inclusive. EXAMPLES
Example #1 range(3) examples <?php // array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) foreach (range(0, 12) as $number) { echo $number; } // The step parameter // array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100) foreach (range(0, 100, 10) as $number) { echo $number; } // Usage of character sequences // array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i'); foreach (range('a', 'i') as $letter) { echo $letter; } // array('c', 'b', 'a'); foreach (range('c', 'a') as $letter) { echo $letter; } ?> NOTES
Note Character sequence values are limited to a length of one. If a length greater than one is entered, only the first character is used. SEE ALSO
shuffle(3), array_fill(3), foreach. PHP Documentation Group RANGE(3)
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