Is shebang always /bin/bash?

No, the shebang is not always /bin/bash. While #!/bin/bash is commonly used for Bash scripts, the shebang can point to different interpreters depending on the script's requirements. For example:

• #!/bin/sh for POSIX-compliant shell scripts.
• #!/usr/bin/env python3 for Python scripts.
• #!/bin/zsh for Zsh scripts.

The shebang should match the interpreter that is intended to run the script.