.bash, but it's less about the suffix and more about the shebang. On some systems sh is linked to bash or perhaps the `sh` executable includes bashisms. The .sh

.bash, but it's less about the suffix and more about the shebang. On some systems sh is linked to bash or perhaps the `sh` executable includes bashisms. The .sh can be argued is signifying Bourne shell compatible/descended shells which would cover both.. but still.