[Linux] Shell

$ cat /etc/shells
# /etc/shells: valid login shells
/bin/sh
/bin/dash
/bin/bash
/bin/rbash
/bin/zsh
/usr/bin/zsh

$ ps $$
  PID TTY      STAT   TIME COMMAND
 7356 pts/21   Ss     0:01 -zsh

$ echo $SHELL
/usr/bin/zsh

chsh -s $(which zsh)
reboot

# huangjian @ huangjian-ThinkPad-T470p in ~ [17:20:31]
$ bash
huangjian@huangjian-ThinkPad-T470p:~$ exit
exit

# huangjian @ huangjian-ThinkPad-T470p in ~ [17:20:36]
$