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Top Forums UNIX for Beginners Questions & Answers Using read to assign value to bash variable not working Post 303043531 by sand1234 on Thursday 30th of January 2020 06:07:03 PM
Old 01-30-2020
Using read to assign value to bash variable not working

Hi,

I am attempting to assign the output of the following command, to two bash variables, var1 and var2 using "read," but it doesn't seem to be working.

Code:
[root@xxx ~]# openstack hypervisor stats show | awk -F'|' 'NR==14{print $2,$3}'
 vcpus                  92

[root@xxx ~]# echo $?
0

[root@xxx ~]# openstack hypervisor stats show | awk -F'|' 'NR==14{print $2,$3}' | read var1 var2

[root@xxx ~]# echo $var1

[root@xxx ~]# echo $var2

Could I get some guidance around what is happening here?

I'm familiar with using var1=$(awk ...) to assign output to a bash variable, but wanted to see how it's done with read.

Thanks.

Last edited by rbatte1; 02-06-2020 at 06:35 AM..
 

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GET_CLASS_VARS(3)							 1							 GET_CLASS_VARS(3)

get_class_vars - Get the default properties of the class

SYNOPSIS
array get_class_vars (string $class_name) DESCRIPTION
Get the default properties of the given class. PARAMETERS
o $class_name - The class name RETURN VALUES
Returns an associative array of declared properties visible from the current scope, with their default value. The resulting array elements are in the form of varname => value. In case of an error, it returns FALSE. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.0.3 | | | | | | | get_class_vars(3) will only return the properties | | | that can be accessed from the current scope. | | | | | 5.0.2 | | | | | | | Calling get_class_vars(3) will now expose all | | | the properties as an array, unlike previous be- | | | haviour where protected and private properties | | | were prefixed with nul bytes. | | | | | 5.0.1 | | | | | | | Calling get_class_vars(3) will expose all prop- | | | erties, as when converting an object to a class. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 get_class_vars(3) example <?php class myclass { var $var1; // this has no default value... var $var2 = "xyz"; var $var3 = 100; private $var4; // constructor function myclass() { // change some properties $this->var1 = "foo"; $this->var2 = "bar"; return true; } } $my_class = new myclass(); $class_vars = get_class_vars(get_class($my_class)); foreach ($class_vars as $name => $value) { echo "$name : $value "; } ?> The above example will output: var1 : var2 : xyz var3 : 100 Example #2 get_class_vars(3) and scoping behaviour <?php function format($array) { return implode('|', array_keys($array)) . " "; } class TestCase { public $a = 1; protected $b = 2; private $c = 3; public static function expose() { echo format(get_class_vars(__CLASS__)); } } TestCase::expose(); echo format(get_class_vars('TestCase')); ?> The above example will output: // 5.0.0 a| * b| TestCase c a| * b| TestCase c // 5.0.1 - 5.0.2 a|b|c a|b|c // 5.0.3 + a|b|c a SEE ALSO
get_class_methods(3), get_object_vars(3). PHP Documentation Group GET_CLASS_VARS(3)
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