Pattern: Unnecessary glob expansion with [
Issue: -
With [, arguments will undergo glob expansion. If a file foo0 exists when the problematic code is run, it will check for the variable foo0 instead of the array entry foo[0]. If there additionally exists a foo1, it will simply fail with an error.
Use [[ ]] or quote the argument.
Example of incorrect code:
[ -v foo[0] ] Example of correct code:
[ -v 'foo[0]' ]