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Full Discussion: Using read to assign value to bash variable not working
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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LEARN ABOUT MOJAVE

mpscnnlocalcontrastnormalizationgradientnode

MPSCNNLocalContrastNormalizationGradientNode(3) 	 MetalPerformanceShaders.framework	   MPSCNNLocalContrastNormalizationGradientNode(3)

NAME

       MPSCNNLocalContrastNormalizationGradientNode

SYNOPSIS

       #import <MPSNNGraphNodes.h>

       Inherits MPSNNGradientFilterNode.

   Instance Methods
       (nonnull instancetype) - initWithSourceGradient:sourceImage:gradientState:kernelWidth:kernelHeight:

   Class Methods
       (nonnull instancetype) + nodeWithSourceGradient:sourceImage:gradientState:kernelWidth:kernelHeight:

   Properties
       float alpha
       float beta
       float delta
       float p0
       float pm
       float ps
       NSUInteger kernelWidth
       NSUInteger kernelHeight

Method Documentation
   - (nonnull instancetype) initWithSourceGradient: (MPSNNImageNode *__nonnull) sourceGradient(MPSNNImageNode *__nonnull)
       sourceImage(MPSNNGradientStateNode *__nonnull) gradientState(NSUInteger) kernelWidth(NSUInteger) kernelHeight
   + (nonnull instancetype) nodeWithSourceGradient: (MPSNNImageNode *__nonnull) sourceGradient(MPSNNImageNode *__nonnull)
       sourceImage(MPSNNGradientStateNode *__nonnull) gradientState(NSUInteger) kernelWidth(NSUInteger) kernelHeight
Property Documentation
   - alpha [read],  [write],  [nonatomic],  [assign]
       The value of alpha. Default is 0.0  The default value 0.0 is not recommended and is preserved for backwards compatibility. With alpha 0, it
       performs a local mean subtraction. The MPSCNNLocalContrastNormalizationNode used with the MPSNNGraph uses 1.0 as a default.

   - beta [read],  [write],  [nonatomic],  [assign]
       The value of beta. Default is 0.5

   - delta [read],  [write],  [nonatomic],  [assign]
       The value of delta. Default is 1/1024

   - (NSUInteger) kernelHeight [read],	[nonatomic],  [assign]
   - (NSUInteger) kernelWidth [read],  [nonatomic],  [assign]
   - p0 [read],  [write],  [nonatomic],  [assign]
       The value of p0. Default is 1.0

   - pm [read],  [write],  [nonatomic],  [assign]
       The value of pm. Default is 0.0

   - ps [read],  [write],  [nonatomic],  [assign]
       The value of ps. Default is 1.0

Author
       Generated automatically by Doxygen for MetalPerformanceShaders.framework from the source code.

Version MetalPerformanceShaders-100				  Thu Feb 8 2018		   MPSCNNLocalContrastNormalizationGradientNode(3)
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