linux-change-user-s-default-shell
Refers:
```sh sudo chsh -s /bin/bash $USERNAME sudo chsh -s /bin/bash user ```
查看用户的默认 Shell：
```sh $ grep user /etc/passwd user:x:1000:1000::/home/user:/bin/bash
$ ps -p $$ PID TTY TIME CMD 22572 pts/1 00:00:00 bash
$ echo "$0" bash ```
查看系统可用 Shell：
```sh $ cat /etc/shells
/bin/sh /bin/bash /usr/bin/bash /bin/rbash /usr/bin/rbash /usr/bin/sh /bin/dash /usr/bin/dash /usr/bin/tmux /usr/bin/screen ```
通过 `type -a bash` 找到 bash 的所有位置。