Yes but I don't understand ...

[David Selby]

Randall R Schulz wrote:

> David,
>
> At 13:14 2003-08-05, David Selby wrote:
>
>> You are dead right, I tried
>>
>> /bin/bash <script>
>>
>> and it worked perfectly, but I am afraid I do not understand why ...
>> echo $BASH_VERSION
>> Tells me I have bash
>>
>> I call cygwin with ...
>> c:\cygwin\win\rxvt.exe -e \bin\bash --login -i
>> ie bash
>>
>> Where did ash (a stripped down bash?) come in ?
>
>
> As I understand it, it all goes back to the big bang...
>
>
> I don't understand the question. Cygwin has for a long time used ash 
> as it's /bin/sh. Ash is a POSIX compliant shell and is much 
> lighter-weight than BASH. For purposes such as interpreting commands 
> issuing from makefiles, it's faster start-up time makes it a better 
> choice.
>
> You script assumed BASH--that is, it used BASH-specific features. Thus 
> it should explicitly invoke bash in its #! line. The fact that most 
> Linuxes use BASH as their /bin/sh probably falsely led you to believe 
> that BASH was _the_ shell in POSIX-compliant systems. That's not true. 
> In fact, for a long time, even /bin/bash was a version 1.2 BASH, and 
> that was a far cry from what we now know as BASH.
>
>
I see the light
Dave


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