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Re: How to include `$$' literally in the PS1 prompt?


From: Andreas Schwab
Subject: Re: How to include `$$' literally in the PS1 prompt?
Date: Sun, 07 Oct 2007 19:41:59 +0200
User-agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (gnu/linux)

"Clark J. Wang" <dearvoid@gmail.com> writes:

> On 9/30/07, Andreas Schwab <schwab@suse.de> wrote:
>>
>> "Clark J. Wang" <dearvoid@gmail.com> writes:
>>
>> > Anybody has any idea?
>>
>> PS1='[\\$\\$=$$ \w] \$ '
>
>
> Sure it works but I don't think this is the way it should be. In this way,
> to include `\\' in the prompt we have to write like this:
>
> $ PS1='\\\\\\\\'
>
> It's really hard to read and understand. Isn't it a bug?

No.  There are two levels of expansion, each using the same quote
character (the backslash).  You can disable the second level with `shopt
-u promptvars', so that quote removal is not applied to the value.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




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