How to use a variable from a block of code in the filename the output is redirected to?

I have a shell script of which I want to capture the output using a block of code (docs).

Additionally I want to use the value of a variable from that block of code in the filename I write the output to, unfortunately that is not working.

How can I re-use the variable from a block of code in the filename?

Minimum example

This is a dummy script showing what I’m trying to do. I have GNU bash, version 5.0.17:

{
    v=1
    echo $v
} >> output-$v.log 2>&1

I set a variable, run some command and want to store the stdout and stderr in a file that has the variable in it’s name (output-1.log in this case).

However, this writes out a file output-.log as if the $v variable does not exist.

What I’ve tried

If I add a semicolon ; after the block of code:

{
    v=1
    echo $v
}; >> output-$v.log 2>&1

The file output-1.log is created, but it remains empty

>Solution :

Initialize the variable before setting up the redirection:

v=1
{
  echo $v
} >> output-$v.log 2>&1