Here are a couple of remarks, so it could be improved further:
1. The shebang is #!/bin/sh, so the script should conform to Posix Shell Standards and not use bash code..
2.:
should be
3.
Can be written as:
4.
$[ ... ] is deprecated bash code. It should be:
5.
should be:
6.
could be written as number=${countdown:$n:1}, but would still be bash code.
Consider using ${var%"${var#?}"} for example and vary the number of question marks...
Another option would be to replace the for loop with a case statement
7.
For security and other reasons it is best to not use the format field for uncontrolled data. So perhaps something like:
8. There should be a wait statement after the last done
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