Bash execution

[ioquatix]

There are a number of different shells, including, e.g. zsh. The current bash script rule matches the file extension .sh which could be any kind of shell script.

The updated implementation will recognise and use #! shebang lines which is ideal, but I'm just wondering whether the file extension should be more specific, e.g. .bash, and possibly adding support for whatever extensions other popular shells use. What are your thoughts?