Pattern: Use of read with unquoted []
Issue: -
ShellCheck found an array element passed to read, where the [] was not quoted. This means the array index [index] will be treated as a glob range, and the word may be replaced or trigger failglob.
In the problematic example, having a directory named food will cause the command to become read -r food instead, since food matches the glob foo[index]. The result is assigning a value to the wrong variable.
Quote or escape the pattern as shown to ensure it always reads into the array foo at index index.
Example of incorrect code:
read -r foo[index]Example of correct code:
read -r "foo[index]"