Consider using braces for expanding an array DOK-SC1087
Anti-pattern
Major
Some languages use the syntax $array[index] to access index of an array, but a shell will interpret this as $array followed by the unrelated literal string (or glob) [index].
Curly braces are needed to tell the shell that the square brackets are part of the expansion.
If you want the square brackets to be treated literally or as a glob, use ${var}[idx] to prevent this warning.
This does not change how the script works and clarifies the intent to other programmers.
Bad Practice
echo "$array[@]"
Recommended
echo "${array[@]}"