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Re: BASH_SUBSHELL documentation misleading

From: Sam Liddicott
Subject: Re: BASH_SUBSHELL documentation misleading
Date: Wed, 23 Mar 2011 20:15:06 -0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20110322 Lanikai/3.1.10pre

On 23/03/11 18:52, Chris F.A. Johnson wrote:

On Wed, 23 Mar 2011, Sam Liddicott wrote:

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DP$ uname output: Linux sojo 2.6.35-28-generic-pae #49-Ubuntu SMP Tue Mar 1 14:58:06 UTC 2011 i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.1
Patch Level: 5
Release Status: release

       man page says:

Incremented by one each time a subshell or subshell environment
             is spawned.  The initial value is 0.

       This suggests that:

       echo $BASH_SUBSHELL ; ( echo ) ; echo $BASH_SUBSHELL

       would not give the same answer for BASH_SUBSHELL

   No, it suggests that:


   would not give the same answer for BASH_SUBSHELL

It should suggest that, because that is how it actually works.

But the man page is misleading and does not actually suggest this.

   In your example, the second "echo $BASH_SUBSHELL" is at the same
   depth as the first.

Yes. But a new subshell environment has been spawned. Each time that happens BASH_SUBSHELL should increase.

Of course I know how it does work, but the man page isn't clear. It doesn't say that the increase is only visible within the subshell and therefore it is a measurement of subshell depth.


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