Question

2

How to use echo output as a variable

rated 0 times [ 2] [ 0] / answers: 1 / hits: 1226 / 2 Years ago, fri, december 3, 2021, 2:50:09

I simulated the situation where the value of variable bar is $foo. foo is a variable too, which has the value hello.

$ foo=hello

$ bar=$(echo "$foo")

$ echo $bar

$foo

How I can get to hello, given foo="hello" and bar="$foo"?

I tried:

$ echo $(echo $bar)

But the output still is:

$foo

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biryanrownies

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answered 2 Years ago ardtry · Accepted Answer

Use eval like this:

$ foo=hello

$ bar=$(echo "$foo")

$ echo "$bar"

$foo

$ eval echo "$bar"

hello

$ foo=world

$ eval echo "$bar"

world

In the above example, the eval bash builtin command will parse the arguments once more, so that the $bar variable contents will be interpreted once more as a variable ($foo) and its current contents (hello in the first case and world in the second case) will be used as the argument to the echo command.