Consider using braces to expand arrays SH-1087

Some languages use the syntax $array[index] to access an index of an array, but a shell will interpret this as $array followed by the unrelated literal string (or glob) [index].

Here, curly braces are needed to tell the shell that the square brackets are part of the expansion.

Problematic code:

echo "$array[@]"

Preferred code:

echo "${array[@]}"

Exceptions:

If you want the square brackets to be treated literally or as a glob, use ${var}[idx] to prevent this warning. This does not change how the script works, but clarifies your intent to the checker as well as other programmers.