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Re: bash 'let' can give error

From: Marc Herbert
Subject: Re: bash 'let' can give error
Date: Fri, 10 Dec 2010 15:49:35 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20101103 Fedora/1.0-0.33.b2pre.fc14 Thunderbird/3.1.6

> let intentionally returns status 1 if the value was 0; and status > 1 if
> there was an error.  Why?  So you can do loops such as:
> countdown=10
> while let countdown--; do ... ; done
>> Why does this happen? Is it 'by design'?
> Yes.  The same as for 'expr' which is standardized by POSIX to have the
> same behavior.

This is a design mistake: it trades a few characters for a lot of confusion.

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