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Re: shebang length limits

From: Chet Ramey
Subject: Re: shebang length limits
Date: Fri, 05 Sep 2014 08:59:44 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.6.0

On 9/5/14, 8:26 AM, The Wanderer wrote:

> While that does address the question of what the actual length limit is,
> it doesn't address the mismatch I saw in the error message which
> occurred when the path was too long. Does that error, and the associated
> mismatch, in fact originate from within bash?

Yes.  All the kernel gives you is -1/errno (the worst is ENOENT).
Rather than print the confusing error message associated with these errno
values, I added the getinterp() logic in an earlier version of
(bash-2.05) to provide more useful information.

> If so, any chance of getting the mismatch fixed, so that the shebang
> printed when the path is too long is at least the full truncated length
> of what was actually searched for rather than only the leading portion
> of that path?

You have to have some length limit, and 80 has been historically
reasonable.  There is no manifest constant available everywhere -- as
you've seen if you've looked at Sven's page -- that provides the correct

``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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