shell命令which

1How do I check which shell I am using? - Ask Ubuntu

2How do I find out what shell I am using on Linux/Unix? - nixCraft

3which (command) - Wikipedia

4How to Use the which Command in Linux {With 5 Examples}

5Different Ways to Check Which Shell You are Using on Linux

63 Ways to Check Which Shell You are Using on Linux

7Determine the Current Shell in Linux - Baeldung