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Top Forums Shell Programming and Scripting Bash question: working with an array of previously set variable strings Post 302927251 by hungryd on Monday 1st of December 2014 05:04:50 PM
Old 12-01-2014
Display Bash question: working with an array of previously set variable strings

while i've used arrays to work with variables, i've never used them to loop through a set of strings and wanted to ask the community for some feedback or assistance.

let me be specific. here's my code:

Code:
# URL port Variables
port2195=`nc -z $url2195 2195`
port2196=`nc -z $url2196 2196`
port5223=`nc -z $url5223 5223`
port443=`nc -z $url443 443`

# Set array
range=( port2195 port2196 port5223 port443 )

echo ""
echo "Now checking the ports..."
echo ""

for i in "${range[@]}"
do
	if [[ "$i" = *succeeded* ]];
	then
		echo "SUCCESS: $i is open/working."
	else
		echo "FAILURE: $i is NOT open/working."
	fi	
done

this code works just fine.... just not in the way that i want!

the script is passing the members of the array exactly as i've typed them, one at a time: port2195, port2196, port5223, etc.

what i'm trying to do and failing to achieve is to pass each member of the array as a previously established string: $port2195, $port2196, $port5223, etc.

changing the names of each member of the array to include a "$", doesn't work, neither does adding a second "$" into the if statement.

i'm not even sure if you can pass strings via an array but, if it is possible, much obliged for someone to drop me a few pointers.

cheers,
 

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MIN(3)									 1								    MIN(3)

min - Find lowest value

SYNOPSIS
mixed min (array $values) DESCRIPTION
mixed min (mixed $value1, mixed $value2, [mixed $...]) If the first and only parameter is an array, min(3) returns the lowest value in that array. If at least two parameters are provided, min(3) returns the smallest 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
min(3) returns the parameter value considered "lowest" 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 min(3) <?php echo min(2, 3, 1, 6, 7); // 1 echo min(array(2, 4, 5)); // 2 // 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 min(0, 'hello'); // 0 echo min('hello', 0); // hello // Here we are comparing -1 < 0, so -1 is the lowest value echo min('hello', -1); // -1 // With multiple arrays of different lengths, min returns the shortest $val = min(array(2, 2, 2), array(1, 1, 1, 1)); // array(2, 2, 2) // Multiple arrays of the same length are compared from left to right // so in our example: 2 == 2, but 4 < 5 $val = min(array(2, 4, 8), array(2, 5, 1)); // array(2, 4, 8) // If both an array and non-array are given, the array is never returned // as comparisons treat arrays as greater than any other value $val = min('string', array(2, 5, 7), 42); // string // 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 examples, both -10 and 10 are treated as TRUE in the comparison $val = min(-10, FALSE, 10); // FALSE $val = min(-10, NULL, 10); // NULL // 0, on the other hand, is treated as FALSE, so is "lower than" TRUE $val = min(0, TRUE); // 0 ?> SEE ALSO
max(3), count(3). PHP Documentation Group MIN(3)
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