Pattern: Missing curly braces for array expansion
Issue: -
For compatibility reasons, $foo[bar] is interpreted as the variable $foo followed by the literal string [bar].
Curly braces are needed to tell the shell that the square brackets are part of the expansion.
Example of incorrect code:
echo "$array[@]"Example of correct code:
echo "${array[@]}"If you want the square brackets to be treated literally or as a glob, you can use ${var}[idx] to prevent this warning.