behaviour of "for (( exp1; exp2; exp3 )); do COMMANDS; done"

[Harald Maier]

Sam Edge <sam.edgeZZZ@lineone.net> writes:

> Stuart Brady <stuart@convex.org.uk> wrote in
> <20030527120718.GA22030@convex.org.uk>
> in gmane.os.cygwin on Tue, 27 May 2003 13:07:18 +0100:
>
>> On Tue, May 27, 2003 at 12:42:21PM +0100, Sam Edge wrote:
>> > Make sure that if your script uses Bash-specific features, it starts
>> > with #!/bin/bash and not with #!/bin/sh. That way it'll work anywhere.
>> 
>> You've made the assumption that bash is always in /bin. I've seen it
>> in /bin, /usr/bin, /usr/local/bin, /usr/contrib/bin, and /opt/bash/bin.
>> ~/bin would be another likely place for it.
>
> I just _knew_ I shouldn't have said "anywhere." ;-)
>
> Unfortunately this is a general weakness in the "#!/xxxx" syntax.
>
> (OT) Does anyone know if any of the common shells, when they see
> "#!/bin/xxxx" at the front of a script, try a $PATH search for an
> "xxxx" executable if they can't find "/bin/xxxx"? This would seem like
> a good idea to me.

Some people are using the env program to use the PATH environment:

#! /usr/bin/env perl
BEGIN { $^W = 1 }

Harald


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