使用bash -i script，您将运行交互式非登录shell。q
bash中-i选项的确切用法是什么？
从man bash开始：

-i        If the -i option is present, the shell is interactive.

shell中交互模式和非交互模式的区别是什么？
有一些不同之处，请看man bash | grep -i -C5 interactive | less：

An interactive shell is one started without non-option arguments (unless -s is specified) and without the -c option whose standard input and er‐
   ror  are  both  connected to terminals (as determined by isatty(3)), or one started with the -i option.  PS1 is set and $- includes i if bash is
   interactive, allowing a shell script or a startup file to test this state.

   When an interactive login shell exits, or a non-interactive login shell executes the exit builtin command, bash reads and executes commands from
   the file ~/.bash_logout, if it exists.

   When  an interactive shell that is not a login shell is started, bash reads and executes commands from ~/.bashrc, if that file exists.  This may
   be inhibited by using the --norc option.  The --rcfile file option will force bash to read and execute commands from file instead of ~/.bashrc.

[...]

When bash is interactive, in the absence of any traps, it ignores SIGTERM (so that kill 0 does not kill an interactive  shell),  and  SIGINT  is
   caught  and handled (so that the wait builtin is interruptible).  In all cases, bash ignores SIGQUIT.  If job control is in effect, bash ignores
   SIGTTIN, SIGTTOU, and SIGTSTP.

例如bash -i -c 'echo $PS1'。