Re: BASH_SUBSHELL is not incrementing when part of a pipeline

[Greg Wooledge]

On Mon, Aug 07, 2023 at 01:56:21PM +0000, Kamil Cukrowski Priv wrote:
> Hi, when BASH_SUBSHELL is part of a pipeline with just a simple command it
> does not increment. Consider the following:
> # docker run -ti --rm bash bash -c 'echo $BASHPID $BASH_SUBSHELL; echo |
> echo $BASHPID $BASH_SUBSHELL'

There are no subshells in that, except for the pipeline.

Invoking "bash -c" does not create a subshell.  It creates a new shell.

You might want to look at the SHLVL variable.  Or redesign whatever it
is you're doing which relies on counting levels of shells and subshells.