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Full Discussion: find max number
Top Forums Shell Programming and Scripting find max number Post 302285486 by Franklin52 on Monday 9th of February 2009 04:05:42 AM
Old 02-09-2009
Quote:
Originally Posted by varungupta
you can simply use the for loop and get the max no. out of the file: as:

max=1

for in `cat a.txt`
do
if [[ $1 > "$max" ]]; then
max=$1
echo "$max" > b.txt
fi
done

Hope this will work to you.
Thanks
Varun GuptaSmilie
The echo statement must be after the loop and avoid the useless use of cat:

Code:
max=1

while read i
do
  if [[ "$i" > "$max" ]]; then
    max="$1"
  fi
done < a.txt

echo "$max" > b.txt

Regards
 

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MAX(3)									 1								    MAX(3)

max - Find highest value

SYNOPSIS
mixed max (array $values) DESCRIPTION
mixed max (mixed $value1, mixed $value2, [mixed $...]) If the first and only parameter is an array, max(3) returns the highest value in that array. If at least two parameters are provided, max(3) returns the biggest of these values. Note Values of different types will be compared using the standard comparison rules. For instance, a non-numeric string will be com- pared to an integer as though it were 0, but multiple string values will be compared alphanumerically. The actual value returned will be of the original type with no conversion applied. PARAMETERS
o $values - An array containing the values. o $value1 - Any comparable value. o $value2 - Any comparable value. o $... - Any comparable value. RETURN VALUES
max(3) returns the parameter value considered "highest" according to standard comparisons. If multiple values of different types evaluate as equal (e.g. 0 and 'abc') the first provided to the function will be returned. EXAMPLES
Example #1 Example uses of max(3) <?php echo max(2, 3, 1, 6, 7); // 7 echo max(array(2, 4, 5)); // 5 // The string 'hello' when compared to an int is treated as 0 // Since the two values are equal, the order they are provided determines the result echo max(0, 'hello'); // 0 echo max('hello', 0); // hello // Here we are comparing -1 < 0, so 'hello' is the highest value echo max('hello', -1); // hello // With multiple arrays of different lengths, max returns the longest $val = max(array(2, 2, 2), array(1, 1, 1, 1)); // array(1, 1, 1, 1) // Multiple arrays of the same length are compared from left to right // so in our example: 2 == 2, but 5 > 4 $val = max(array(2, 4, 8), array(2, 5, 1)); // array(2, 5, 1) // If both an array and non-array are given, the array will be returned // as comparisons treat arrays as greater than any other value $val = max('string', array(2, 5, 7), 42); // array(2, 5, 7) // If one argument is NULL or a boolean, it will be compared against // other values using the rule FALSE < TRUE regardless of the other types involved // In the below example, -10 is treated as TRUE in the comparison $val = max(-10, FALSE); // -10 // 0, on the other hand, is treated as FALSE, so is "lower than" TRUE $val = max(0, TRUE); // TRUE ?> SEE ALSO
min(3), count(3). PHP Documentation Group MAX(3)
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