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Substitute a variable inside a variable [message #380177]

Fri, 09 January 2009 07:13

ganeshsv
Messages: 51
Registered: January 2006

Member

HI,
How can we substitute a variable inside another variable. Say for example

country=IN
IN_REGION=SOUTH
VALUE=${${country_REGION}

We are getting bad substitution error. How this can be achieved?

Thanks in advance,
GS

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Re: Substitute a variable inside a variable [message #380180 is a reply to message #380177]

Fri, 09 January 2009 07:17

tahpush
Messages: 961
Registered: August 2006
Location: Stockholm/Sweden

Senior Member

VALUE=${country}_REGION

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Re: Substitute a variable inside a variable [message #380181 is a reply to message #380177]

Fri, 09 January 2009 07:18

Frank Naude
Messages: 4381
Registered: April 1998

Senior Member

Not sure I understand what you want.
What should "echo $VALUE" return?

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Re: Substitute a variable inside a variable [message #380182 is a reply to message #380181]

Fri, 09 January 2009 07:21

ganeshsv
Messages: 51
Registered: January 2006

Member

HI,
We would like to get the output in VALUE field as SOUTH.

country=IN
IN_REGION=SOUTH
VALUE=${${country}_REGION} [as $country=IN, $IN_REGION=SOUTH]

Thanks in advance,
GS

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Re: Substitute a variable inside a variable [message #380188 is a reply to message #380182]

Fri, 09 January 2009 07:53

Frank Naude
Messages: 4381
Registered: April 1998

Senior Member

#!/bin/bash

country=IN
IN_REGION=SOUTH
eval VALUE=\${${country}_REGION}
echo VALUE=$VALUE

For more info, search "name reference variables".

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