A lot of the time you don't even have the luxury of assuming "bash" is present, you've got only "sh". Since all valid "sh" syntax is valid "bash", you've got t

A lot of the time you don't even have the luxury of assuming "bash" is present, you've got only "sh". Since all valid "sh" syntax is valid "bash", you've got to restrict yourself to only sh-valid code in the event the host doesn't have bash. I have gotten used to doing this -- these scripts usually wind up being run in Docker containers that don't have "bash" installed for the sake of minimalism. IE, you can't use [[ $predicate ]], but instead [ $predicate ], etc. Lot of subtle differences.