Re: echo $BASH_SOURCE in Test_Bash_2.sh

Hi Stephen,

Please consider migrating to MinGW-users; I'd like to deprecate this 
list.  Thanks.

On Wednesday 18 March 2009 00:55:16 Stephen Grant Brown wrote:
> In Test_Bash_2.sh
>
> I have
>
> echo $LINENO
> echo $BASH_SOURCE
> echo $LINENO
> pwd
> echo $LINENO
>
> The following is the output of a msys shell
>
> $ Test_Bash_2.sh
> 1
>
> 3
> /src
> 5

And you expected to see `./Test_Bash_2.sh', rather than that blank 
line between `1' and `3'?  I can't reproduce this; I see:

  $ uname -orv
  1.0.11(0.46/3/2) 2009-01-29 00:39 Msys

  $ sh --version
  GNU bash, version 3.1.0(1)-release (i686-pc-msys)
  Copyright (C) 2005 Free Software Foundation, Inc.

  $ cat > foo.sh <<\EOF
  > #!/bin/sh
  > echo $LINENO
  > echo $BASH_SOURCE
  > echo $LINENO
  > pwd
  > echo $LINENO
  > EOF

  $ foo.sh
  2
  ./foo.sh
  4
  /home/keith
  6

(Note that I added a shebang, which accounts for the line number
 differences, but the result is similar without it).

> I am using msys on a Windows XP machine

What versions of MSYS, and bash?

> Under cygwin on a Windows ME machine I see the Test_Bash_2.sh
> filename printed.

FWIW, I see the same on my Ubuntu-8.04-LTS box, but I also see it in 
the latest MSYS-1.0.11 snapshot, on Win2K, with bash-3.1.0(1).

> Why am I not seeing it on this machine?

Perhaps you are using an older version of bash?  In any case, I'd 
caution against using $BASH_VERSION in this fashion; see:

  $ man bash
    :
  BASH_SOURCE
      An array variable whose members are the source filenames
      corresponding to the elements in the FUNCNAME array variable.
    :
  FUNCNAME
      An array variable containing the names of all shell functions
      currently in the execution call stack.  The element with index
      0 is the name of any currently‐executing shell function.  The 
      bottom‐most element is "main".  This variable exists only when
      a shell function is executing.  ...

Note that $BASH_SOURCE is an array variable, and it is related to the 
$FUNCNAME array variable, which is empty (undefined) when not within 
the scope of execution of a shell function.  Thus, the behaviour you 
see, (i.e. $BASH_SOURCE is empty), actually seems to me to be more 
consistent with the documentation.

If you want the file name for the current script, get it from $0.

-- 

Regards,
Keith.

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