Pattern: Use of [ ] for test in Bash/Ksh
Issue: -
ShellCheck has been explicitly asked to warn about uses of [ .. ] in favor of the extended Bash/Ksh test [[ .. ]].
[[ .. ]] suppresses word splitting and globbing, supports a wider variety of tests, and is generally safer and better defined than [ .. ].
Example of incorrect code:
[ -e /etc/issue ] Example of correct code:
[[ -e /etc/issue ]]