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From: Jani Tiainen <redetin@luukku.com>
Subject: Re: Unable to properly execute a let statement from a shell script
Date: Mon, 31 Jan 2005 09:52:40 +0200
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Message-ID: <ctko42$4a8$1@sea.gmane.org>
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Paolo Gesmundo kirjoitti:
> Hi all,
> 
> I am running bash on XP
> 
> I have a very simple script a.sh
> 
> a.sh:
> 
> ====================
> export P=1
> let Q=$P+1
> echo P=$P
> echo Q=$Q
> ====================
> 
> Case 1)
> If at prompt I run:
> 
>> a.sh
> 
> let: not found
> P=1
> Q=
> 
> Case 2)
> If I run:
> 
>> bash a.sh
> 
> P=1
> Q=2
> 
> I know that I could modify a.sh by adding #!/bin/bash
> at the top of the file but I would need to avoid this
> otherwise I have to modify too many scripts
> 
> Is there a way to run a.sh like in Case 1 and get the
> proper result like in Case 2?

No. Because there is no specifiaction which shell system must use if you 
omit that from first comment line. It can use same as users, or sh, csh, 
ksh, bash or what ever it might comeup.

So you have to but it there to be sure, and by using simple script you 
can do it in a batch so there is very little manual work needed.

So, script execution (note that running script is _always_ done in new 
shell process in *nix style system) is a bit different from Windows/DOS 
batch files.

-- 

Jani Tiainen


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