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From: "Andrej Borsenkow" <Andrej.Borsenkow@mow.siemens.ru>
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Subject: RE: PATCH: pws-24: prompt escapes for script/function and lineno
Date: Tue, 29 Jun 1999 19:40:26 +0400
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>
> Incidentally, bash prints more than one "+" at the beginning of each line
> when xtracing a subshell (that is, a parenthesized or otherwise grouped
> list of commands), so you can see how deeply nested the forking is getting.
> Is there a way to duplicate that effect with PS4 formats?
>

%L - current value of SHLVL. Something like "+(%L):%N:%i> " ? If it is suitable
default is another question.

/andrej