Re: Bash and the PS1 environment variable [was: grep: show matching line from pattern file]

[Will Mengarini]

* David Christensen <dpchr...@holgerdanske.com> [22-06/02=Th 19:18 -0700]:
> [...]
> Now I can almost match your prompt -- there is a dash before 'bash':
>
> 2022-06-02 19:05:10 dpchrist@laalaa ~
> $ PS1="\\h/${TTY#/dev/} \\s$SHLVL \\w \\A \$?\\\$"
> laalaa/pts/8 -bash1 ~ 19:08 0$
>
> The dash seems to be coming from the '\s' bash(1) -> PROMPTING ->
> backslash-escaped special characters:
>
> 2022-06-02 19:12:58 dpchrist@laalaa ~
> $ PS1="\\s"
> -bash

The dash indicates you're running a login shell.  That's useful
information, because a login shell is initialized differently.
See section INVOCATION in `man bash`.

You see in the rendered prompt it says "-bash1"; "1" is $SHLVL.
If you run another bash from inside that bash, and again set PS1
as you did above, you should see "bash2" instead of "-bash1".