Re: PS1 is not implemented as specified in IEEE Std 1003.1-2017

[Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>]

Berthold Lorke <berthold@xxxxxxxx> wrote:
> Hello!
> 
> The POSIX standard specifies for PS1 
> https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
> 
> 
> ```
> PS1
> 
> Each time an interactive shell is ready to read a command, the value of 
> this variable shall be subjected to parameter expansion and written to 
> standard error. The default value shall be "$ ". For users who have 
> specific additional implementation-defined privileges, the default may 
> be another, implementation-defined value. The shell shall replace each 
> instance of the character '!' in PS1 with the history file number of the 
> next command to be typed. Escaping the '!' with another '!' (that is, 
> "!!" ) shall place the literal character '!' in the prompt. This volume 
> of POSIX.1-2017 specifies the effects of the variable only for systems 
> supporting the User Portability Utilities option.
> ```

Dash doesn't support the full set of UPU options and that includes
history.

Cheers,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
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