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sindi keesan wrote:
>
> I notice that BL3 has a file /shell (/etc/shell?) 
> listing four shells  

Not usually.  Perhaps it was installed with one of
your shell packages?  

> Is bash the default

bash is normally the default in Linux; however, I
used ash in BL3 to save space.  For most purposes 
the BL3 version of ash is identical to bash.

> Is SHELL something you set in the environment?  

It is usually set automatically (by login).  It
can also be set manually.

> Is PS1 a way to set the prompt in ash/bash?  

Yes.

> You can use tcsh and probably zsh to correct typos 
> in commands or let you edit them (yes/no/edit).  

bash (and the BL3 version of ash) also allow you to
edit the commandline.

> to show me where I am here without pwd.  
> I don't know why this is not the default.   
> Is it the default for ash/bash 

No.

> or was it set that way in profile for BL3?  

Yes.  PS1='\w<\$>'

> There are also ways (at least in zsh) to set it 
> to show the time and date.

Also in bash:
----------------------------------------------------
\t     the current time in HH:MM:SS format
\d     the date in "Weekday Month Date" format 
\n     newline
\s     the name of the shell, the basename of $0  
\w     the current working directory
\W     the basename of the current working directory
\u     the username of the current user
\h     the hostname
\#     the command number of this command
\!     the history number of this command
\$     if user is root, a #, otherwise a $
\nnn   character corresponding to this octal number 
\\     a backslash
\[     begin a sequence of non-printing characters
\]     end a sequence of non-printing characters
----------------------------------------------------
Most of those work in ash too.

You can even use colors in the prompt:
--------------------------
PS1='\w\033[31m \$ \033[m'
--------------------------

Cheers,
Steven

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