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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 DEBIAN

struct::compare

Compare(3pm)						User Contributed Perl Documentation					      Compare(3pm)

NAME

       Struct::Compare - Recursive diff for perl structures.

SYNOPSIS

	   use Struct::Compare;
	   my $is_different = compare($ref1, $ref2);

DESCRIPTION

       Compares two values of any type and structure and returns true if they are the same. It does a deep comparison of the structures, so a hash
       of a hash of a whatever will be compared correctly.

       This is especially useful for writing unit tests for your modules!

PUBLIC FUNCTIONS

       o   $bool = compare($var1, $var2)

	   Recursively compares $var1 to $var2, returning false if either structure is different than the other at any point. If both are
	   undefined, it returns true as well, because that is considered equal.

BUGS
/NEEDED ENHANCEMENTS
       o   blessed references

	   compare currently does not deal with blessed references. I need to look into how to deal with this.

LICENSE

       (The MIT License)

       Copyright (c) 2001 Ryan Davis, Zen Spider Software

       Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the
       "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish,
       distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to
       the following conditions:

       The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
       CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
       SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

AUTHOR

       Ryan Davis <ryand-cmp@zenspider.com> Zen Spider Software <http://www.zenspider.com/ZSS/>

perl v5.12.4							    2011-07-04							      Compare(3pm)
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