assign variable value to another value dynamically in shell script

Question

I am phrasing variables in shell script and expecting some value but shows another value, example shows as below:

export var_a_b="12345"
var_a="a"
var_b="b"
echo ${var_a_b} # Output: 12345 (shows properly)

new_var_a_b="var_${var_a}_${var_b}"
echo $new_var_a_b # Output: var_a_b (But I am expecting actual value of var_a_b i.e 12345)

Can someone help me on where I am placing wrong.

score 1 · Answer 1 · answered Jan 31 '22 at 12:04

1

You need parameter indirection:

$ a=b
$ b=c
$ echo "${!a}" # c

answered Jan 31 '22 at 12:04

Andreas Louv

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Please don't answer common duplicates; instead, vote to close as duplicate. – tripleee Jan 31 '22 at 12:06

assign variable value to another value dynamically in shell script

1 Answers1